Mamono no Kuchibiru

At first, it was a small "favour".

Kibakura had instantly fallen in love with, Aikyou, his junior one grade below him. They had first met at last year's ball game tournament, where they had a short conversation. Since that day Kibakura would often watch Aikyou in the library after school....

Aikyou quickly saw through the situation and asked Kibakura for a favor in exchange for letting him do what he wanted...