KakafukakaKa Ka Fu Ka Ka ; Ka ka Fuka ka ; KKFK ; カカフカカ

24-year-old Aki finds herself newly single when her long-time boyfriend cheats on her. She begins living in a sharehouse with a former classmate and boyfriend from junior high, Tomoya but he has his own personal problem. For the last two years, Tomoya has struggled with erectile dysfunction but finds himself “reacting“ to Aki, and so he asks for her help to cure him.