[DeepL Translation - needs review] Volume 1 Introduction: Naruse Uta, an ordinary high school student, has a secret that he can't tell anyone. It is that he is in love with Kaoru, his brother's wife. It's a love that will never bear fruit, but she is happy with their daily activities, and on the other hand, her heart feels as if it will burst when she sees her brother's newlywed life... She stifles her heart. She suppresses her heart so that the love she has secretly hidden in her heart will...
Interesting and off to a pretty good start. Feels like it has room to grow, and could be a bit more fleshed out though, so I'm curious to see if the author will meet that potential in the next volume.
Update: I finished the series - it was really excellent. Definitely recommend!