The man in the dirty work clothes was a cleaner at the apartment building where Miyu lived. Despite seeing him regularly, he was an "invisible person" to Miyu, a resident. When the man told her this, she realized it for the first time. And she felt ashamed of herself. Because Miyu had also been ostracized by her friends as an invisible person since adolescence. A strange and intense day was about to begin for Miyu, who had been suddenly assaulted and raped, and the dirty middle-aged man...