Takashiro Mitsu

A couple become unwilling accomplices in sex and murder.

Haruki spends most of his time with friends and fellow classmates Airi and Ayana. All seems well, that is until Airi and Ayana form separate clubs, the Mechanical Science Club and the Chemical Science Club. The two vie for Haruki's attention and hilarious chaos usually follows all attempts to make him join.

Based on the erotic game by Waffle Arahama Yuu has 5 sex-friends. One day, his easygoing sex-life reaches a precipice. One of his partners, Shimizu Misako, who is also a co-worker at his company, had been sleeping with him on the understanding that they would marry. However, he only considered her a sex-friend, and even revealed the existence of the other 4. Incensed, she has him gather the other 4 together in his apartment Shimizu discovers that Arahama has surrounded himself in the company of many beauties of differing personalities: Yanagi Ryouko who runs a cafe near Arahama's apartment; Hoshino Kotori, a schoolgirl acquaintance; Endou Makiko, who manages a large company; and Kamishima Aina who he met on an online dating site Shimizu demands that Arahama stops having casual sex and marries someone. but the situation gets heated and confusing until Arahama somehow ends up proposing to all of them Arahama then visits all of them individually to try to withdraw his proposal

After a string of failed jobs, Keiichi Oyamada lands work at a small manga cafe. Things seem to be looking up from day one. His best friend is his manager and he gets to work alongside the beautiful Rei Suzukawa. Also, his cute childhood friend, Kururu Hiiragi, is a regular—and she's all grown up! So why couldn't Keiichi hold down a job before? Due to a series of bizarre coincidences, he always seems to end up having sex with every single female coworker! Although he hopes to finally end this deadly cycle, Keiichi will soon find out that bad habits die hard.