Takako Shimura's 'Sayonara, Otokonoko' Manga Ends in 3rd Volume

Manga about man who suddenly wakes up in body of child self launched in 2016

source http://www.animenewsnetwork.com/news/2020-03-28/takako-shimura-sayonara-otokonoko-manga-ends-in-3rd-volume/.158052