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A strange figure appears during a thunderstorm at the academy. Mira deduces that the magic trace from the mysterious person matches another incident in the “Eternal Library.”
Arata Kasuga is living an average life with his cousin Hijiri until the sun suddenly goes black. As the world he knows collapses, Arata enters a reality of mages and mystery.
When Arata and the girls are trapped in his room by a magical seal, the group tries to figure out how to escape. Unfortunately, among the panic, Arata’s power is unleashed.
Arata begins to learn about the magical world he’s found himself in, including the magic seven archives and spells.
Another breakdown occurs, and the group realizes that it was caused by a member of the Trinity Seven losing control.
The dark mage Liese attacks in possession of a demon lord seal and steals not only Selina’s magic, but also Arata’s. Who will protect the school when it falls under attack?
Liese witnesses the Headmaster’s grimoire. However, as she visits Selina, Liese attempts to absorb the rest of the Trinity Seven’s magic, only for Arata to burst in.
Arata is given a committee position, and the Trinity Seven accompanies him to another magic academy, where Arata meets a friendly face.
In a world of rifted dimensions, Arata and the girls try to survive the onslaught of monsters, but when things go too far, Arata’s emotions awaken the dark power inside him.
After the transformation into the demon lord, Arata is nearly drained of magic. However, he doesn’t get much time to recoup, as a uniquely powerful mage aims to kill him.
The school is again under attack from a demon lord candidate. While Yui tries to evacuate the students, Levi goes to fight the threat on her own.
The Trinity Seven stands by Arata’s side as he faces off against the one he wants to save the most.
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