Swweeet

Susumu Hayashi, his twin brother Tsutomu and Sakura Toyama are childhood friends. Tsutomu disappeared when he was ten years old. Then two years later, he reappeared—this time only in front of Susumu. And what’s more, from inside a mirror! Now, events that no one has ever experienced take place in this bizarre love triangle!!

(Source: Kotonoha)

Included one-shots:
Volume 1: Lakeside
Volume 2: Playback