Yūto's sister, whose name is Wakako Sakaeguchi (Sakaeguchi Wakako) is the older sister of Yūto Sakaeguchi. They also have a little brother who doesn't speak.
One of Wakako's interests include being a manga contributor. She is a second year in Jousai University and is in the Department of Literature.
Yūto's sister has medium brown hair kept in two ponytails. She wears comfortable clothes and glasses.
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