One of the protagonists investigating the mystery of his sister's disappearance.
Identity and daily life
First-year student at Kyoka Academy High School, 16 years old. Her feelings are weak, she speaks little, and lacks vitality; her condition worsened after her sister disappeared for two years.
Character relationships
An email of unknown origin prompted him to take action. His twin sister is Aoi Yumezuki, and his childhood friend Sakuya Kawahara takes care of him.
PS2 Version Route A: Crossword scene
In Route A, Hinata solves a crossword puzzle in the story. Players watch his problem-solving process, but the game does not turn this scene into an interactive crossword puzzle.
I/O・A′: searching for Sakuya
On route A′, Hinata begins searching for Sakuya. After the Exarc is attacked, he finally reunites with her.
I/O・B′: the final handshake
At the end of the B′ route, Hinata and Mayumi shake hands and smile at each other.
Related entries
- Appearances:I/O
- Twin sister:Aoi Yumezuki (I/O)
- Childhood friends:Sakuya Kawahara (I/O)
- Hinata searches for and reunites with Sakuya on route A′:Sakuya Kawahara (I/O)
- Mayumi shaking hands and smiling at the end of B′:Mayumi Shinozuka (I/O)
References
- REGISTA: I/O Character Introduction (Original Official Website Archive)
- Yusuke Nagomi: I/O PS2 version gameplay diary
- LEIBSTANDARTE MITUKI HAYASE: The Evening Star
- LEIBSTANDARTE MITUKI HAYASE：ボクハココニイルヨ
- GAME Watch: I/O original character preview
Data compiled on: 2026-10-10.