Hikari, Akari(Akai), Saki and Sato are cousins. they live in a same roof but different room(obviously,lol) and went to the same high school which was called as sakura high school. they actually fall for the famous boys from the school (uh, a group of boys) which was called as Yamato, Chiaki, Shiro and Akihiko. they were in a group which known as "the hollow silk"