Dunno if this got the axe or if it was intended to be a short series from the beginning (probably the former), hard to find much of anything on the mangaka, but chapter 13 was the last.
I didn't have high expectations for how they would handle Satsuki's feelings for Rika as a girl but I was pleasantly surprised-- he's not a bad person for falling in love, but he needs to consider how it would impact Rika before acting on it.
The only thing with that b-plot is that it comes with the implication that Satsuki has trouble seeing Rika the way that Rika sees himself. I would've preferred for the story to delve into Rika's transition journey after graduation, and Satsuki's perception of Rika gradually falling in line with Rika's, maybe realizing he likes him as a boy more than he did as a girl or lose his feelings entierly.
There were so many bases this had the foundation to touch. This manga deserved a much longer run.
After School Mate