My friend's mother, Kazuyo Iruma, always took care of me. She was a married woman and worked busily as a nurse. Within the eyes of the protagonist, Kazuyo was simply his friend's mother but now...a story of something opposite unfolds.... "Ahaha, an old woman like me as your partner, what are you saying~" With the protagonist passionately asking her continuously, Kazuyo who didn't take him seriously finally crossed the line... The married nurse who did what's not supposed to be done ultimately forgets her family and spirals into her new-found addiction with her son's friend.