Prominence wa Kujikenai

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]