Koi wa Etude! - Vol. 1 Ch. 4

[MangaDex]

 

[RedKed]

As expected, the 3rd chapter rival turns out to be a good guy and a friend. On the other hand, Hoshino switches up between being tsundere and straight up ignoring boundaries and kissing Kamizaka after declaring his intent to keep him to himself.
At least he confessed, and Kamizaka enjoys his company and all