Koromo Amae is a premier member of the reigning champion Mahjong team, Ryuumonbuchi, and one of the most idolized yet feared players in the game. She is said to be possessed by a demon when playing; she even outranked a professional Mahjong player at a previous tournament. She is also the key player that brings an end to Kazekoshi's winning streak. She has a bad habit of wanting to crush her opponent's pride.

She is Touka's cousin, their relationship akin to those of siblings due to the amount of time they have spent together. She prefers to not be seen as a child, despite their small stature and her childish personality. She acts in a very friendly manner, always wanting to make friends with everyone she meets and in hopes of being treated lovingly.