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Ichika, Nino and Itsuki plot ways to make a move on Futaro during the school trip. Yotsuba is troubled by their change in attitude.
The quintuplets' father tries to get Futaro's classmate, Takeda, to take over as their tutor. They make a bet.
With desperation increasing, things become tense amongst the sisters as well as with Futaro. For their elective tour on the last day of the school trip, the quintuplets decide to keep things fair by leaving the outcome to luck.