'Miku' who is a steady person but has a habit of delusion, 'Kanna' who is a natural but fussy lover, and the two have been best friends since elementary school. Miku goes to the same school, but feels jealous of Kanna who gets along with her new classmates. "Hey, we'll always be friends, right? We're special, right? Why don't we make a signal for just the two of us?" Friendship gradually changes to affection ... The relationship between the two escalates to extreme sex.
