Kawashima Youko
河嶋 蓉子
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| Kawashima Youko河嶋 蓉子 | |
| Measurements | Height: 162cm, Weight: 51kg |
| Hair | Black, Long |
| Eyes | Violet |
| Body | Young-adult |
| Personality | Airhead, Brother Complex, Carefree, Deredere, Friendly, Kind, Pervert, Whimsical |
| Role | Full Sister, Older Sister, University Student |
| Visual novels | Side character - Tsuisou no Augment Main character - Tsuisou no Augment |
| Voiced by | Himari |