from Nakaimo - My Sister Is Among Them! (Kono Naka ni Hitori, Imouto ga Iru!)
A third-year silver-haired bespectacled girl who dresses as a witch. She runs the Lyrical Sister Café which she describes as "a dream-like café where anyone can become an older brother or older sister!" Prior to the story, her biological parents abandoned her as a toddler because of her mathematical intellect and she was adopted by a university professor. She lived with her adoptive mother who owned and ran the café until she died. Afterwards Mei lived with her father in Massachusetts until she earned enough money to buy back the café.
Nakaimo - My Sister Is Among Them! (Kono Naka ni Hitori, Imouto ga Iru!)
