Koi desu ga Koi ja Nai

Ujihara-kun is a playboy who doesn't get serious when it comes to love. He often plays around behind his girlfriend's back and does not refuse when a girl approaches him, until a certain schoolmate caught him in the act. He turned her into an accomplice and the two had a risky relationship, but will it only be just a form of skinship, or something more will develop?

(Source: MU)

Included 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