The mysterious bond between a woman named Mai, who can't escape the memories of her abusive parents, and the "Cosplayer Killer," a murderer who kills while wearing a cosplay suit.
Mizukawa Rei is a 30-year-old office lady who decides to quit her job at a real estate company and start an "art subscription company" with a friend. Around the same time, Rei meets a handsome young freelance photographer named Arima Shuto, and they start dating. Rei is very excited with her life as she is experiencing a new job and a new romance. However, after two months into the relationship, Rei notices that Shuto never initiates kisses nor want to have sex with her, which throws Rei into a confused state of "Why won't he want to do it with me even though we're dating?"