Chihiro Aoi

葵千広

A mysterious boy who had celebrated Sakuya's birthday and then vanished without a trace afterward only to return later as a student at Shiina's school. He lives with his uncle and aunt. [Spoiler] Since around chapter 27, the manga revealed a very tragic story of why Chihiro has such a personality (being bad to Shiina) and moved to Shiina's place. (This relates to him and his previous girlfriend, Sakura.) [/Spoiler]