Hiro Matsubayashi is a first-year student at Fujioka East High school and a founding member of its newly-created karuta club.
Shun is Hiro's older brother.
Arata is his upperclassman who is starting a karuta club.
- Hiro and his brother are in the same academic grade.
- In Be-Love's latest character poll, Hiro's given name is pronounced as Kou (こう).
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