Read manga: Hana Wa Nisemono

manga
Artists: Sengoku Hiroko
Status: completed
Latest chapter: Vol.1 Chapter 8.5
Updated at: Aug 25, 2019
Summary:

Mori and Ayumu are a gay couple in college in a happy relationship. However, after Ayumu prays at a shrine for them to always be together, the shrine's deity intervenes by turning him into a girl, and now everyone except for them think Ayumu has always been a girl.