Sukina Ko no Shinyuu ni Hisoka ni Semarareteiru

I have confessed countless times to my first love, Misa Yosaki, who is strong, proud, and cuter than anyone else when she smiles, only to be rejected every time. But I'm unwilling to give up, even though Yosaki's best friend, Haru Hinata, keeps getting in my way. And for some reason, Yosaki likes to watch us bicker with each other with a smile on her face. Our slightly unusual but peaceful daily life gradually begins to crumble due to a certain "invitation". "You can do whatever you like with me… as a substitute for Misa." Tearful eyes. Soft skin. Together in a room, just the two of us. Hinata, who was supposed to be just a friend, approaches me with a feverish plea…!? (Source: Sneaker Bunko, translated)