|Relationship(s)||Haruki Serizawa (younger brother)|
Saku Akechi (friend)
|Occupation||High School Student (former)|
|Novel||Kokuhaku Yokou Renshuu: Hatsukoi no Ehon|
|Anime||Itsu Datte Bokura no Koi wa 10 Centi Datta.|
Chiaki and Haruki look one in the same, but his hair is slightly messier than Haruki's. He has blond hair like his brother, but his roots are brown. In the anime however, the brown roots are done away with and his hair is completely blond like Haruki.
His school uniform is worn open.
Little brother. Served as a role model for him and loved his brother dearly.
Close friend and schoolmate. They always made sure to hang out together whenever they could.
- Chiaki also had a habit of eating lollipops, something that Saku would later take up himself.
- Like Haruki, Chiaki's name is inspired by the seasons. His given name contains the character for fall (秋, aki).