This is the best BL anime I've ever watched. First, let's talk about the animation and art. They're all excellent, the movements aren't monotonous, and they also maintain the retro art style of the manga. Second, the music and voice acting.They use a different song for each ending, in a retro Japanese pop style. It's a brilliant idea. As for the voice acting, although I prefer Hirose's voice acting in the drama CD, the current cast isn't too bad. As for Nakamura's voice acting, I always remember Strak from the anime Frieren, LOL (they're the same voice actor). And third, and most importantly, the story. I really likeit because we get to see the perspective of the main character, who is a same. I'm tired of most BL anime where the main character is the weak uke and the same is the handsome and popular guy.
I was a bit worried about the story at first when they announced it would be 13 episodes, with the source material being two manga volumes with a few short chapters, but so far they've done a good job with some great extra scenes and also some deleted scenes of Hirose and Otogiri-sensei.

In conclusion, if you're tired of mainstream BL anime with boring uke MCs and want a different perspective, you should definitely give this one a try!