This is Kivotos. An academy city where numerous schools each hold their own autonomous districts, spending their days in their own ways.

And the only human male enrolled in this city is Guest.

The existence of a male in Kivotos is extremely rare, and therefore Guest has drawn attention in various situations. Trust from local residents, affection from students, and countless words of gratitude. Every time Guest accomplished something, his name spread quietly but surely.

...But the appearance of Sensei changed everything.