She is a classmate of Karen Tendou from class 2-A at Otobuki High School and a member of a non-school recognized gamer appreciation group together with Keita Amano and Tasuku Uehara. Chiaki is a shy girl and very reclusive. She did not seem to care about her looks at first until Keita and Tasuku came into her life. She did not socialize much and mostly preferred to play games on her own.

Spoiler

After she discovered that Keita was both "Tsucchi" and "Yama" was her online gaming friend she develops romantic feelings towards Keita