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Although he didn't have a strong sense of mana manipulation and chant reduction, he was enrolled in Alzano Imperial Magic Academy at the young age of 11. He did not fit in very well at the academy, only being seen as a hindrance or pest because of his low skill and supposed poor use of magic, such as his development of The Fool's World. As a result, Glenn was not allowed to participate in many school activities, and missed out on having a fun life at the academy.
However, his talents were acknowledged by the Imperial Court Mage Corps, and he graduated at the age of 15. He joined the imperial court mage corps and swore to become a mage of justice to fight for the people.
For the next three years, Glenn was an outstanding mage assassin code-named "The Fool", and became friends with Albert Frazer and Re=L Rayford. At one point, he saved a young Rumia Tingel from a group of assassins and told her he'd side with her even if the world was against her.
Disinterest in Magic Edit
His time in the military eventually caused him to lose his admiration and interest for the magic arts, as he viewed it as nothing more than killing tools. These jaded views resulted in him being dishonorably discharged from the military, and he left the world of magic behind.
Following this, he mostly lived off Celica and did not leave her home for a year. Celica worried for him and decided to have him serve as an instructor at his old academy, although hesitant he agreed.
New Magic Instructor Edit
Late on his first day Glenn ran through the town, yelling at two girls who were in his way to move. His yelling scared them as he was flung into the sky by one of them, causing him to land in a fountain but he emerges alright though in an eccentric manner. He notices one of the girls, who he seems to recognize, her friend, Sistine, throws him in the sky with her magic, and he falls in the fountain again. Glenn heads for the school and encounters the girls from before in his class, but denies knowing them though they point otherwise. Glenn simply lazes about in class and doesn't bother teaching the students, much to their annoyance, especially with Sistine, who soon challenged him to a magic duel which he lost due to his slow chant.
Despite his loss, he still lazed about, and when criticized for his lack of interest in magic by Sistine, Glenn insulted magic by stating it is merely a tool used to kill. She slapped him, stated she hated him, and ran away crying as he was unfazed by it.
Later on, while alone he was thinking of resigning from his position until he found Sistine's friend Rumia Tingel trying to perform a spell with a magic circle. He soon helped her with completing the magic circle. Glenn later told her of his past before he became a teacher as Rumia tells him a tale from when she was saved and being very thankful towards the mage who rescued her. She then encouraged Glenn to continue being a teacher and apologize to Sistine after he is told her reason for loving magic was due to a connection to her late grandfather. Pondering on this act and encouragement, Glenn choose not to resign.
The next day, Glenn arrived to class on time where he bowed his head and sincerely apologized to Sistine, much to her and the class' (save a gleeful Rumia) surprise. Though he reiterated his disdain for magic, he admitted his words went a little too far before apologizing to her again. After that Glenn decided to teach, as the class wondered what brought this change in him. He then insulted the class as they brought up his lack of talent in chanting as he agreed but decided to show them other ways to use magic, as they were amazed by it. With his new teaching style, he began regularly conducting lectures and became rather popular in his class and even students from other classes had snuck in for one of his lectures. Glenn even gained praise from the other teachers as well as the ire from Halley Astry who was flummoxed at his popularity. Though he now teaches, he still doesn't act properly as shown while he treats some students well especially Rumia, he still treats a few mostly Sistine with mockery This was shown when he erased a lesson on the board after she politely asked him not to, or when he had her carry more books than Rumia, after she offered to help.
Glenn became very happy with his role as a teacher, as noted by Celica Arfonia who remarked on this change as he apologized for worrying her. He later helped Rumia and Sistine with some work while rude to Sistine, he answered receptively to Rumia while stating to an angry and curious Sistine he treats them differently Rumia because Rumia is sweet while she's cheeky, much to her annoyance. One day, while running late, Glenn found the town deserted and sensed a presence and told the person to come out as it was revealed to be Carrel Mardos who told him he was going to kill him before attacking Glenn. It is unknown exactly what occurred in their fight but Glenn effortlessly overpowered Carrel and humiliated him by tying him up and stripping him, as he left the unconscious and naked man for the town to find.
Glenn then went to the academy where he found a guard that had been killed and took out a magic card that would allow to get through the barrier protecting the academy. He pondered on what to do since he didn't know how many enemies there were and wanted to call for back-up but a explosion from his class alerted him.
Glenn soon entered the school and casually walks into a room where he finds Sistine about to be assaulted by Jin Ganis, a criminal who was comrades with Carrel. He nearly leaves thinking it was mutual but she tells him to save her from being assaulted as he realizes the situation, to Sistine's irritation at his late realization. When Jin demands to know how he entered, Glenn shrugs this off as Jin tries to attack, as Sistine warns Glenn, but he ignores this. However, Jin can't attack, due to Glenn revealing a spell on a card known as The Fool's World that blocks off magic but reveals it affects him too. Jin breaks out laughing wondering how a mage can fight without magic, as Glenn reveals he'll use his fists and overpowers Jin, making the latter's attempt to fight back futile. Jin recognizes the fighting style as the one the Imperial Army uses and questions Glenn's identity as Glenn gives his name and his status as substitute teacher.
Jin was surprised to hear that Glenn was the same teacher that Carrel was assigned to kill, he realized that the latter lost and questioned how his comrade lost to a man who resorted to brawls than magic. He is then asked by Glenn if he is feeling bad after he lost to something other than magic as he plans to finish him with a punch but this was a trick as Glenn kicks him in the face, knocking him unconscious and defeating him.
Glenn freed Sistine and hinted at some of his past but Sistine stopped him by pointing his pants being down, to his dismay. Glenn soon tied up Jin and discovered his alignment with the Researchers of Divine Wisdom just as Celica contacted him. He informed Celica of the situation and they discuss what to do next, with Celica being at a conference and the portal to the school destroyed; Glenn knew he had to take action.
After he found out Rumia was taken, he was confused as to why they went for her and stopped a crying Sistine from going after her since she'd be in danger as well. Sistine then tearfully agreed with Glenn's previous statement about magic but he comforted her and told her he'd kill the other criminals to save Rumia.
His statement causes Jin to awake and laugh, telling Sistine that Glenn is no different from him or his comrades pointing out his feat in taking him down. At that moment, a portal opens with living skeleton who attack Glenn who can barely stand against them until Sistine provides help. With that, Glenn destroys a majority of them as he and Sistine retreat as Jin taunts them before he is killed by the skeletons. Glenn tells Sistine they have no obligation nor time to save the criminal before he tells Sistine to use a spell for him. When she states she can't do so, he tells her she can if she listened to him but does threaten to dock her grade, to her dismay.
After Glenn destroyed all the skeletons, Reik confronted Glenn and Sistine with swords enchanted in magic. He remarks that Glenn was no ordinary mage as he took down two of his comrades but Glenn stated Reik killed Jin as he justified his killing of Jin since he strayed from the mission and had to be punished for his actions.
Glenn then pushed Sistine out of the way as he prepared to engage Reik who revealed he was aware of Glenn's The Fool's World and he knew Glenn couldn't deactivate active magic which meant his swords would be unaffected. Reik then attacked Glenn who suffered a few wounds from the strikes before trying to use a spell which Reik dispelled and tried to use it himself. However, he stopped as he realized Glenn's strategy was to get him to use a spell so he could use fool's world ands attack him with his fists. He further realized Glenn's status as an instructor was a façade and questioned his identity but after getting a vague answer, he decided to give Glenn a quick death as a form of respect.
Glenn was soon stabbed multiple times and started to use a chant to deactivate the spell, just as Sistine helped him in dispelling the magic in the swords as Reik realized Glenn tossed Sistine aside as a strategy to catch him off-guard. The criminal tried to activate his swords again but Glenn used The Fool's World and stabbed Reik with one of his blades that was without magic.
Critically wounded, Reik finally recalled Glenn as the famous mage assassin The Fool before he died unable to understand his defeat.
Glenn soon collapses from his wounds and dreams of his time as an assassin before awakening in the infirmary being tended to by Sistine. He briefly reprimands her for her continuous use of healing magic but is told by the worried girl, it was needed to save him and he rests once more. Glenn then recalls his time of wanting to be a mage of justice until he wakes up again to find Sistine asleep.
He is contacted by Celica and tells her he already took down to of the criminals, as she tells him that his theory of the portal to the school being destroyed was accurate. The two then realized there was inside man and Rumia was still present on the grounds.
Glenn then snuck out of the infirmary and promised Sistine he'd save Rumia. Leaving, Glenn was attacked by rock golems guarding a tower as he deduced Rumia was being held there. After avoiding several attacks, he made his way through the building and located Rumia.
Glenn then meets the last criminal his predecessor Huey Lysen and quickly used The Fool's World that blocks off magic but Huey reveals that it helped his plan, showing off a magic circle Rumia is trapped in which Glenn couldn't see in the dark. Huey reveals once Rumia is teleported, his soul which was connected to it would cause an explosion to destroy the academy though he gives Glenn the chance to save Rumia or himself.
Not hesitating, Glenn works hard to save Rumia and though wounded he puts in a lot of effort. However, he soon collapses and looks like he won't be able to do so, as he is taunted by Huey him but is shocked when Rumia heals him and transfers enough mana to help him allowing him to save her.
As Huey reflects on his path and laments on how it probably would have been easier to remain a teacher as he asks Glenn for an answer. However, Glenn admits he doesn't care as Huey made his choice and punches Huey for putting his students in danger. Huey was then knocked unconscious and Glenn fell unconscious in Rumia's lap. Much later, Huey is arrested for his crimes.
A month passes, Glenn learns of Rumia's past from Celica but decided it was no bother. He is then questioned as to why he decided to become a full time instructor as he remarks that his smiling students brought this about just as Rumia and Sistine arrive with questions.
Magical Festival Edit
Begging the head master or Celica for money, Glenn was rejected and was blasted at by Celica but the head master told Glenn of a way to get money. He informed Glenn of the magic festival and stated if his class were to enter and win the competition, he would get the money for it. Recalling Sistine and Rumia asking for his help in this and him shrugging it off, Glenn changed his perspective and rushed to the classroom.
Glenn then shows up in the classroom just as Sistine and Rumia were trying to get members. His recent ignoring of this is brought up but he ignores it and tells them he'll make the decision of who joins as the class prepare for headache. However, Glenn surprises them with his declaration of leading them to victory as he starts his selection method which earns surprise and protest from many of them until he gives his reasons since there are events which are best suited for a few. In his selection, Glenn shows he has been paying attention to their talents as they are surprised and flattered by his faith in them, though Sistine unknowingly ruins a possible change of plans because of a disagreement with Gibul Wisdan who had suggested another plan.
Afterwards, a sullen Glenn soon recalled that he was ostracized from joining the games when he was a student, which was why he forgot about it. He then saw the smiling faces on his class training which changed his perspective before he saw them about to brawl with Class 1.
Intervening, Glenn questioned this before Halley Astry arrived as Glenn irritated him by purposely getting his name wrong. Halley then told Glenn to get his class out of the area as they are nothing but a hindrance, which caused Glenn to reflect on being called that name as a child. In response, Glenn got angry when Halley insulted his class and told him his class will win as he made a wager of three months salary with him on which of their class will win the magic games festival. Glenn's choice got his students to smile at his belief in them while he realized what he said in his anger and attempted to take it back before Sistine once again ruined his plans as Halley accepted the bet confident he'd win. Glenn then got over his compromising situation and decided to train his class in preparation of the games.
At the games, the class performed with enthusiasm and success that surprised even Glenn who was beginning to think they might actually win but he got uneasy with their constant praise of him after they believed it was due to his belief in them.