Kohaku Kou
小伯 紅
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| Kohaku Kou小伯 紅A | |
| Aliases | お紅さん, Okou-san, Coco |
| Birthday | 27 August |
| Hair | Blunt Bangs, Long, Ponytail, Red, Sidehair, Straight |
| Eyes | Blue |
| Body | Pale, Slim, Teen |
| Clothes | Clothing with Ribbons, Hairpin, Knee-high Socks, Loafers, Pleated Skirt, Puffy Sleeves, Ribbon Hair Accessory, Ribbon Tie, Sailor School Uniform |
| Items | Brass Instrument |
| Personality | Watashi |
| Role | Non-blood-related Sister, School Music Club President, Younger Sister |
| Engages in (Sexual) | Not Sexually Involved |
| Visual novels | Side character - Tamayura Mirai |
| Voiced by | Suzuya Maya |