Living together with Erika gives Nagi an opportunity to focus on exam prep, except when they run into trouble.

Sachi notices something going on between Erika and Nagi and decides to try to get to the bottom of it. Both she and Nagi are on the verge of a big decision.

Erika and Nagi are stuck in a power outage. Nagi goes to the front door to find an emergency kit, when the unthinkable happens.

Nagi is beginning to question his own feelings, and he has trouble even focusing on midterms.

Erika, Hiro, Sachi and Nagi make plans to study at Erika’s vacation house, but there ends up being a slight change in the roster.

Erika, Hiro, Sachi, and Nagi spend more time at the beach home retreat, and eventually, clues about Erika's missing older brother are found. This incites Nagi to search for him around the nearby town with Erika by his side.

The household visits the diner to attend Yohei's birthday party and learn some family secrets surrounding them. The next day after a study session, Erika succumbs to a cold that she caught, and the household, including Hiro, scrambles to help her through it.