At the request of his childhood friend, Ryota's parents, Hikaru takes care of his grandfather, Kozo, an elderly man. Kozo had lost the will to live after being preceded by his wife, but he was smiling in front of the angelic Hikaru. Hikaru is concerned about Kozo's health and provides him with the same kind of intimate care as a family. Then, Ryota, who secretly had feelings for Hikaru, became jealous of the relationship between the two and planned to destroy it. However, as a result, it leads them to a deeper and obscene forbidden world ... #班長P