Ch. 9: After his apartment collapsed, Tougo became roommates with Sai, who fills his loneliness by bringing people home for sex. However, Tougo becomes annoyed after Sai jokingly asks if he'll be his partner for the night.
Ch. 4-5: Shuu and Chitose are roommates with a tense relationship. Even when Shuu is in the room, Chitose will invite girls over, but he only invites girls named Aki.
Vol. 1 Ch. 4: Kidaka tells his lover of 3 years, Kazu, he wants to go back to being friends. Kazu accepts it and they return to being just roommates. Kidaka immediately starts bringing girls home girls, telling Kazu he can do the same. However, Kidaka is troubled, when he sees Kazu with another man instead
Ch. 1-2: Reo takes care of his selfish and socially-withdrawn lover, freelance photographer Shinri, who only wishes for beautiful things and avoids filthiness
Ch. 4: Sonoda dated Matsumoto in high school, but they broke up when he hurt Matsumoto by denying their relationship, when asked about it. Now, Sonoda has met Matsumoto again, while working together as chefs and living as roommates. But, Matsumoto seems like a different person.
Ch. 6: Tomoya started living with his friend and crush Kiichi after college. When Kiichi repeatedly breaks their, mutually agreed, rule to not have people stay over, Tomoya tells him if it happens one more time he's moving out.
Ch. 3: A man gets trapped in an elevator with his rude copywriter, but after talking for a while, the copywriter suddenly begins planning their marriage.
Ch. 5: After his neighbor Moriyama's wife leaves him, Mizukawa helps train him to stop being useless
Ch. 2-3: Perverted good for nothing Ryujiro resigned from his job just to live with his childhood friend and lover Aki. But, when Aki tells him to stop being useless, Ryujiro suddenly stops paying attention to him
Ch. 1-3,5.5: One the way home, Natsuo finds a hungry man, Keisuke, sitting outside. Natuso takes him home, feeds him, and the two have sex, but when he wakes up Keisuke is gone. The next evening, Keisuke returns and the two start living together, slowly learning more about each other.
Hatsujou Kareshi