Wanting nothing but a quiet life where noone will bully her, Usa somehow finds herself adopted into Rin's group of misfit friends. Quiet and shy, she often finds herself and her unusually large breasts at the butt of the joke. Unlike Rin and Kuro, Usa is extremely naive when it comes to sexual matters and has to rely on her friends for advice - which is not always the best thing when she is completely in love with Rin's cousin, Reiji.
|Kodomo no Jikan (2007)||Secondary|
|Kodomo no Jikan: Anata ga Watashi ni Kureta Mono||Secondary|
|Kodomo no Jikan: Kodomo no Natsu Jikan||Main||No voice actors found.|
|Kodomo no Jikan: Ni Gakki||Secondary|
|Kodomo no Jikan: Ni Gakki Kuro-chan to Shiro-chan||Secondary||No voice actors found.|
|Kodomo no Jikan: Rin's Classroom Diary||Secondary||No voice actors found.|
|Kodomo no Jikan||Secondary|