Wow at first I didnt realize this story is based on Koyuki Higashi story which is the first legally approved same sex marriage in Japan.
I first know of her on NHK show titled her story, too bad the show already expired on the nhk vod, fortunately someone upload the episode on youtube
Here if you wanna watch it https://m.youtube.com/watch?v=CKCgDAV16b4

Really glad her activism of LGBT really spread out everywhere, including manga