Body-Killer!

Akira, a pastry chef, has been having one-night stands ever since he broke up with his ex-boyfriend, even though they had great physical chemistry. Then he meets a college student, Hikaru, who is as pure as an angel. Maybe Akira can finally forget about his ex and find a new love. When Akira goes to Hikaru's house, he is surprised to find his ex-boyfriend, Akutsu, there. It turns out that Hikaru lives with Akutsu!

(Source: Tokuma Shoten, translated)