"I had sex with Mr. Kanai." Akane's bombshell lights a fire in Hanabi, and she vows to fight back. Meanwhile, she tries to go back to being friends with Sanae, but...

Moca finds herself going out on her first date with Mugi, even though she knows that he doesn't really have feelings for her. She's dreamed of going out on a date with Mugi for so long. Moca tries to convince herself that it's the happiest day of her life, but...

Summer break is here. Hanabi and Mugi both decide they will confess their feelings to their crushes after they complete their summer homework assignments. They are beginning to realize that they can no longer view each other as 'replacements' for their crushes as the time to confess their feelings draws near.

Hanabi and Mugi made a promise to see each other again after they confessed their feelings to their respective first loves, but Mugi never showed up. Not soon after, Hanabi accepts an invitation from Sanae to go on a trip to Karuizawa with her.

Mugi is her student since her tutoring days. Narumi is her colleague she only became interested in after she discovered Hanabi's feelings for him. Both men have fallen for Akane, but she still feels unfulfilled.