Sei
生
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| Sei生A | |
| Aliases | セイ |
| Measurements | Height: 176cm |
| Birthday | 22 April |
| Hair | Black, Short, Spiky Bangs |
| Eyes | Black, Hosome |
| Body | Androgynous, Pale, Slim |
| Clothes | Belt, Boots, Choker, Fedora, Fingerless Gloves, Half-Skirt, Robe, Studs, Sweater, Tank Top |
| Personality | Boku, Kind, Stoic |
| Role | Older Brother, Twin Brother |
| Voiced by | Iguchi Yuuichi |