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Koharu Mimasaka is one of the main characters of Oni Uta and its sequel game. A game about a young man who is killed and brought back to life after he attempts to stop a burglary. In return, the girl who brings him back to life decides to make him take care of her, causing conflict between him and the girls he is close to.
Koharu resembles her brother and is regarded for her good looks. She has fair skin and large, violet eyes. Her long black hair is worn with a thin white ribbon with a bow on each side of the head.
Koharu is normally shown in a white and grey school uniform or her miko attire.
Despite being the older sister Koharu is completely useless and is well-aware of that. She can be clumsy and air-headed at times and depends on her brother, Akito, for essentially everything. She is childish by default and highly spoiled, so she doesn't like to see her brother interacting with others- especially girls.
In hopes of winning Akito's affection, she attempts to become a little more reliable.
Akito Mimasaka - Her older brother. She is entirely devoted and obsessed with him, and attempts to work on improving herself to gain his attention. He spoils her and often complains about it- but he continues regardless and cares deeply for his sister.
Ayako - A long-time friend of the Mimasaka siblings, and currently best friend to Koharu.
Himeka - The mysterious girl who brings Akito back to life and demands he makes up for her using almost all of her power to do it. Despite having similarities with Koharu they often bicker because they both demand Akito's attention.