Vampire Dekiai Paradise

Rikka Miku, a first year junior high school student, has a childhood friend named Shiraha Kou, who is kind and handsome, but has a bad mouth. After entering junior high school, Kou becomes a member of the school's idol group "Colors", which is made up of four good-looking boys, gets his ears pierced, and hangs out with a flashy senior. Miku becomes worried and asks Kou about Colors, but he warns her not to get close to the members. In fact, the members of Colors, including Kou, have a secret...

(Source: Natalie, translated)