Mavie' (メイヴイ, Meivui) is an orphan kid who was adopted by Kirishima Eiji. She is shy and doesn’t talk because of the trauma of losing her parents, but loves to hang around and listen to the elders of the Gardening Club. Klaus saves her after she is kidnapped by the Kuzumi Yakuza group.
She lost her parents in one of the many incidents that occur within Hellsalem's Lot. After that, she was taken in by Kirishima and took a liking to gardening, often hanging around the folks in the Gardening Club. When the Kuzumi clan came searching for Kirishima, they kidnapped her. Klaus rescued her.