Ritsu and Fumiya get into an argument on Ritsu's birthday, which causes a massive change in their relationship.

When Ritsu's ex-boyfriend and coworker comes over to the apartment, Fumiya starts to get a little concerned.

Watching as Ritsu moves out of their shared home, will Fumiya be able to salvage their relationship?

Ritsu and Fumiya go on another vacation to a cottage they visited once before, and Fumiya reminisces on the happy times they had back then.

Ritsu is shocked to learn that he and Fumiya used to date, and he decides to learn the truth for himself.

Fumiya decides to hold off on telling Ritsu about their past relationship for the moment, while Ritsu says he'd like to walk around to the places they used to spend time together.