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Three years prior to the story, Rumia was a princess whose real name is Ermiana who was rumored to have died. But in fact, she actually was banished for being a "supernatural".
While in banishment, she was kidnapped but Glenn Radars saved her at the request of the Empress. Glenn told the crying girl that he'd always be on her side which left her touched. Sometime later, Ermiana took on the name Rumia Tingel and was taken in by the Fibel family.
A New Instructor Edit
Rumi travels through town to school, on her way she heals the injury of a man telling him not to tell as magic off-school is forbidden as the grateful promises to keep her secret. Rumia then meets with her friend and foster sister Sistine Fibel, they discuss the new teacher for their class.
While walking, they are surprised by a running man who screams at them to move, causing Sistine to use magic which causes him to fall into a fountain and emerges in an eccentric manner. Despite this, Sistine apologizes for her action which is further accredited the man's arrogant behavior. When the man notices Rumia, who immediately recognizes him as the mage who saved her. The man seems to recall her but Sistine throws him in the sky with her magic and he falls in the fountain again.
Later on, the two make it to school and are shocked to see the man from earlier is their new teacher. The man reveals his name is Glenn Radars who acts lazy and earns Sistine's dislike for not teaching which results in them arguing and her running out after he scorns magic.
However, Rumia was better treating to Glenn as when he finds her using a magic circle he helps complete it. Later on, he tells 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.
The next day, Rumia was delighted to see that Glenn heeded her advice as he showed up on time and apologized to Sistine. She was even more happy to see him deciding to really teach and showed the class real magic. Sistine soon told Rumia that Glenn tricked her by acting like a slacker while he was really amazing as an instructor and wondered what brought about this change in him.
Rumia was delighted by Glenn's change and tried helping him carry books as Sistine offers help as well. Glenn showed he still behaved immaturely towards Sistine as he gave her more books to carry than Rumia and when he erased a chalk writing of the lecture, just to spite her after she asked for him not to do so. When the girls went to Glenn for help in a lesson, he was rude to Sistine while receptive towards Rumia's request. A frustrated Sistine soon then asked Glenn about the difference in his treatment between her and Rumia, to which he explains that Rumia is sweet while she is quite cheeky, much to her irritation and Rumia's amusement.
Very soon, members of Researchers of Divine Wisdom invaded looking for Rumia and threatened to harm her classmates. They interrogated her class but got no answer though Rumia revealed herself after they tried to harm Sistine. Jin Ganis tells Rumia he knew all along and he wanted to play a game where he'd kill her classmates until someone who wanted to live told him. As she is taken away, Sistine asked Rumia if she is sure as she tells her that she believes Glenn will save her though they are told he is dead, much to their disbelief. Reik Fohenheim then tells Rumia that he and his group are aware of her status as a princess and that her class will be taken for experiments. After Reik hands Rumia over to Huey Lysen (her old instructor), Rumia pleads to the man before Glenn who is revealed to have survive all three of Huey's comrades appears.
Glenn 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.
Rumia tries to get Glenn to run and save himself, but not hesitating Glenn quickly works hard to save Rumia and though wounded he puts in a lot of effort to disperse the circles. As he so, Rumia tries to deter him but he confides in Rumia about how he wanted to be a mage of justice as child and he won't give up now. However, he soon collapses and looks like he won't be able to do so, as he is taunted by Huey him but Rumia heals him and transfers enough mana to help him allowing him to save her and stop Huey's spell.
Rumia watched as Huey was then knocked unconscious by angry Glenn who soon fell unconscious in her lap. Much later, Huey is arrested for his crimes.
A month passes, with Glenn deciding to become a full time instructor as he remarks that his smiling students brought this about just as Rumia and Sistine arrive with questions.