Kare no Shouzou

Main story:
Not-so-prodigal son Natsuki, who's mother is a famous artist, comes home to get some cash (or something that he can sell), only to get caught and mistaken for a robber by a stranger in his own home. It turns out that the stranger is a student/assistant artist named Asou, that Natsuki's mother has allowed to lodge in their house. Asou seems like a polite, delicate flower and Natsuki enjoys picking on him. One night, Natsuki takes a trip to an infamous gay bar and sees Asou there. Asou was showing a different face there. At first, Natsuki thought it was a mistake. He goes back again and meets Asou face-to-face and finds out about his true and horrible personality.
Tonari no Heya de:
Serious Igarashi lives next door in his apartment to his friend/co-worker, Ichikawa. Ichikawa brings home a new woman almost every night and is nosy about Igarashi's habits. But overall, he is a very caring guy and gets along with everyone. Knowing Igarashi constantly buys his meals from convenient store, Ichikawa barges into his apartment and cooks for him. Its a nice friendship for the both of them. However, Ichikawa is unaware that Igarashi is gay. One night Igarashi meets with an ex-lover and takes him back to his apartment. After the guy leaves, unfortunately, Igarashi notices that Ichikawa came home early that day and finds out the truth about him.
(Source: MU)