Musume no Tomodachi女儿的朋友; 女兒的朋友; 娘の友達; My Daughter's Friend; L'amie de ma fille; Bạn của con gái tôi; One of the great secrets of a femme fatale.; L'un des grands secrets d'une femme fatale.

Kosuke has lived to play the ideal self as a father at home and as a manager at work. However, his life changes 180 degrees when he meets his daughter’s friend. In front of her, Kosuke was able to be his real self and his worn-out heart was healed. However, He knows that these are feelings that should never be held. The story of the Middle Aged Man Meets Girl, presented to the modern people who suppress themselves in society, begins.