Kimi to Boku. - MangaDex

Shun, Kaname, and the twins Yuuki and Yuuta have been friends since kindergarten. It's a little hard to tell if they actually get along or not - but even as high-school students, they hang out together. Recently, they've had a new addition; a half-Japanese transfer student Chizuru, who has started to liven up the group. This manga is really just about their daily lives, which aren't particularly passionate or exciting. A tranquil and sometimes comedic story of youthful friendship…

Link ~Boku to Kimi no Aida~ - MangaDex

Anime/manga — Kimi to Boku Vol. 16 Omake part 2

Kimi to Boku no Saigo no Senjou, Aruiwa Sekai ga Hajimaru Seisen - MangaDex

Boku to Kimi (Gyaru) ga Fuufu ni Naru Made Ch.5 Page 3 - Mangago

Kimi ga Boku no Subete - MangaDex

Boku wa Kimi no Tori ni Naritai - MangaDex

Boku to Kimi wa - MangaDex

Boku to Kimi to de Niji ni Naru - MangaDex

Boku wa Kimi no Mono - MangaDex

1 Chapter 9 - Kanojo ni Naritai Kimi to Boku - MangaDex

Kouun na Kimi to Boku no Mirai - MangaDex