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Fuutarou's Flashback Arc is covered entirely in Volume 5.
- Start of the arc: Fuutarou reminiscence about his past (Chapter 33)
- End of the arc: Suspicious, Fuutarou asks Nakano Quintuplets if they ever met him in the past (Chapter 35)
Fuutarou is hospitalized. When the sisters visit him, they find his condition is getting better. Itsuki is curious about why Fuutarou studies so hard, so he tells her a story about a young girl from 5 years ago. Strangely enough, Itsuki owns an item similar to the one in the story, which she obtained from the same place and time frame.
Fuutarou tells Itsuki about his past, and when Itsuki shows him a charm, he suspects that one of the Nakano Quintuplets is the girl from the past.
Hospital Visit and Flashback (Chapter 33)
Girl from the Past (Chapter 34)
The Suspicion (Chapter 35)
- Itsuki asks Fuutarou about his reason to study.
- Itsuki learns about Fuutarou's past and his reason to study.
- Fuutarou suspects that the girl from his past is one of the Nakano Quintuplets.