They say hard work equals success, but is that really true? 21-year-old university student Ryuuhei would disagree. After spending years only studying Japanese, he finds himself unprepared to enter the real world, despite being top of his class. Right before his senior year begins, he stumbles upon a mysterious book called Lingua Magi.

Through unexpected events, Ryuuhei vanishes from the world and finds himself at Lingua Magi—the greatest Japanese language academy of the cosmos. His only skill becomes a superpower, as the Japanese language literally functions as a magic system there. At first, everything seems perfect—he gets to make use of everything he's learned. —Duels, a cool cloak, abilities... What more could he ask for?

However, he quickly learns that the school is not what it seems. If he succeeds in clearing its brutal trials, he gets to go home, hardened with the skills needed to make a proper living with Japanese. If not—he might just perish.