Otto wa Jitsu wa Josei Deshita

Classmates Tsushima and Wafuko have been married years after graduating from high school. One day, Wafuko comes out to Tsushima as a trans woman. Fortunately for Wafuko, Tsushima is pansexual and it's not the first time someone came out to her as trans.

Note: First published as a Twitter doujin, whereafter it was serialized on Palcy and received a volume release by Kadokawa.