Tensei Mae wa Otoko Datta no de Gyaku Harem wa Okotowari Shite Orimasu

Tasuku Nakamura, who was thrown into the sea in a marine accident and tried to help his best friend, instead ended his short life of 25 years. Formerly a mediocre office worker, when he opened his eyes, he was in the form of a six-year-old baron's daughter, Sophie Linier. At first, she was confused by the changes, but she was reincarnated as a beautiful girl and decided to live as a lady in a different world. The struggle of a 6-year-old girl with the soul of a 25-year-old male begins.

Official JP: Comic Earth Star, Official channel of Comic Earth Star in Nico Nico Seiga

Original webnovel: Shousetsuka ni Narou