Tanetsuke Oji-san to Papakko JD Saimin Seikatsu The Animation

This is an anime adaptation of the Doujinshi of Kirin Kakeru.

Since childhood, Karen is in love with his father. But one day, she lost all contact with him. Having experienced this event as a trauma, Karen developed a hypnotic memory disorder. Thus, a master of hypnosis took advantage of this situation to pass himself off as his father.