Hirotaka invites Narumi to his house after work, but Narumi starts acting weird. As they head to his place, Narumi talks about her childhood memories, but tells Hirotaka that she doesn't remember how they started being friends. Hirotaka has a sad look on his face as he listens.

Hanako and Kabakura see Narumi having fun talking to a Starbocks barista and start to get suspicious. However, it turns out that the young guy she was talking to is actually Hirotaka’s younger brother, Naoya Nifuji. Afterwards, they all end up going over to Hirotaka’s house together.

Hirotaka asks Kabakura what he and Hanako are like when they’re alone. Kabakura answers that they’re the same as Hirotaka and Narumi, but Hirotaka doesn’t fully believe him, and proposes a new idea to Narumi on the way home.

Narumi goes over to Hirotaka's place on the last day of vacation while fantasizing about how Hirotaka would react when she shows up unannounced. However, when she rings the doorbell, no one answers.

OVA adapting Tarou Kabakura and Hanako Koyanagi's high school life chapter.

Bundled with the seventh volume of the manga.