|Mamiya Marie間宮 麻理絵|
|Hair||Claret, Long, Sidehair, Side Tail, V Bangs|
|Body||Big Ass, Makeup, Mole, Pale, Younger Appearance|
|Clothes||Choker, Dress, Fingerless Evening Gloves, Hairpin, Hair Tie, High Heels, Sling Bikini, Thigh-high Stockings|
|Role||Mother, Wealthy, Widow|
|Visual novels||Main character - Great Deceiver|
|Voiced by||Nakano Shino|
The infamous Mistress of the Mamiya Conglomerate. She wants the protagonist to serve as her personal trainer to help her maintain beauty and youthfulness.