Heart no Kisetsu is Ito Tsukasa's 9th single.
- Lyrics: Matsui Goro
- Composition: Tokura Shunichi
- Arrangement: Kawamura Eiji
- Catalog Number: KV-3075
- Both songs were used in the anime series Hikari no Densetsu, where Ito voiced the main character Hikari Kamijou.
- Heart no Kisetsu (ハートの季節; Season of the Heart)
- Kataomoi no Humming (片思いのハミング; One-Sided Love Humming)