Futaro is studying at home when Itsuki arrives to give him his tutoring pay. Futaro attempts to refuse it because he has not succeeded at making all of them study. However, his sister Raiha persuades them both to take her out for a trip to the arcade, where they have fun and take pictures in a photo-booth. As the sun starts to set, they run into the other four quintuplets, who are all wearing yukata for the upcoming festival. Yotsuba invites Raiha to come see the fireworks with them, which Futaro agrees to – provided that they all study first. Later, at the festival, Ichika flirts with Futaro but then takes a secretive phone call, while Yotsuba muses that Raiha would be her little sister if she were to marry Futaro one day...