[➕ Adding Assets] A story of humans and strange beings unfolding at the boundary of day and night

They were each other's first love, and were meant to be the last.

I'm a ninja who will throw shurikens faster than bullets.

What if I become the only guy in an all-gyaru, delinquent private girls' school and get bullied?

You are my familiar!

The knight commander with 0 dating experience is my contract lover?

The Grand Duke of the North likes me so much. (But why doesn't he express it?)