Yuzuha Riko - Female - 20 years old - Current university student - Lost her memories in a car accident (to the point of total erasure) - Only knows where she lives; has absolutely no memory of her relationships or past events

Tenko Shibuki - Female - 20 years old - University student - Extremely close with Riko - Working hard to help Riko recover her memories

Aokumo Rin - Female - 20 years old - University student - Close with Riko (not best friends, but friendly) - Helps Shibuki in the effort to restore Riko's memories

Hanako Nana - Female - 20 years old - University student - Extremely close with Riko (childhood friends) - Working hard to help Riko recover her memories