Akuyaku Reijou Level 99: Watashi wa Ura-Boss desu ga Maou dewa Arimasen  

Villainess Level 99: I May Be the Hidden Boss but Im Not the Demon Lord, 悪役令嬢レベル99 ～私は裏ボスですが魔王ではありません～, Villainess Level 99: I May Be the Hidden Boss but I'm Not the Demon Lord, Akuyaku Reijou Level 99: Watashi wa Ura Boss desu ga Maou de wa Arimasen, ชีวิตไม่ง่ายของนางร้าย LV99, Light Magic and the Hero, Злодейка 99 уровня: Да, я скрытый босс, но не повелительница демонов

The game you're referring to takes place in the varschein kingdom, where having dark hair is seen as abnormal. eumiella dolkness, the daughter of a count and disliked from birth due to her black locks, is also the hidden boss. at five years old, she remembers her past life in japan but isn't interested in romance. instead, she focuses on training her rare dark-type magic. despite this, eumiella aims to avoid becoming the hidden boss and staying out of the spotlight. when she enters the magic academy, her level 99 status is revealed, causing a stir. her abilities are unmatched, and with her black hair, she stands out. to make things worse, the original heroine suspects eumiella may be the demon lord. can eumiella achieve her wish for a peaceful life?