Koi Desu ga Koi Janai

Ujihara-kun is a playboy who doesn't take love too seriously. He often does unfaithful things behind his girlfriend's back and never refuses when a girl comes on to him, until a certain schoolmate catches him in the act. He tries to seduce her into becoming an accomplice, as the two begin a risky relationship, but will it only be just a form of skinship or can it become something more?
Note: Chapter count includes two bonus chapters and four one-shots:
Volume 2: Himitsu to Itta Sono Kuchibiru de, Princess wa Ouji wo Sagasanai
Volume 3: Kare ni wa Ienai Yoru, Kossori Neko wo Nusumu Tabi ni Deta