Alt. title: おとなごっこ
From Exiled Rebels Scans: Even though Mitsuru has a pretty face, he is followed by rumors about his promiscuity. In reality, he goes out night after night looking for strangers to have sex with. Rumors are flying around school that he is a flirt, but this is convenient for Mitsuru who doesn’t want to make friends with anyone. However, new transfer student Hasegawa is irritated by this attitude and he begins to follow Mitsuru around. Will Mitsuru’s loneliness be revealed as Hasegawa crashes into his life and stirs up his heart?
– chapter 1