Ryuto Kashima's friends force him to confess his feelings to Runa Shirakawa.

Ryuto did start dating Runa, but Ryuto's pals warn him that it's "a joke for those popular types." Ryuto feels the cold stares of his classmates and worries he could get dumped at any moment as he starts planning his first date with his new girlfriend.

Ryuto is shocked when Maria, the girl who turned him down in junior high, suddenly transfers to his school. Ryuto struggles to keep his distance. Tough gyaru Nicole then surprises Ryuto even more with the news that his girlfriend's birthday is coming up.

When Ryuto boldly announces in class that he is Runa's current boyfriend, Maria bolts from the room. Ryuto follows and asks her if she is responsible for the nasty rumors about Runa. Maria's answer reveals a shocking connection between the two girls.

Runa invites Ryuto to the beach to celebrate their anniversary.

Maria confesses her desperation to become Ryuto's first, even if that means dressing and acting like Runa.