April 1st. It's a magical day where anything can happen.

Lupine and his fairy, Prominence, have too much free time after searching Alice's room. For some reason, a magic circle suddenly appears at their feet, and they are summoned to another world.

They arrived in the library tower. There are two girls summoned there--.

After exploring the tower, can the two return to their original world!?

[Translated from official website]