Izumi Onigiru

Izumi Onigiru is Kasumi's twin sister, and together are also Kasaida's older sisters. She loves Kasaida both as a sister and in a romantic manner, and sees Heisuke as a love rival, but has always instinctively worried about yearning for a male, so she might have found an answer in the relationship between the two of them.

Izumi is a quiet and calm black haired Oni. She rarely expresses her emotions, making her somewhat of a kūdere character.

Personality
Izumi is quiet, calm and very stoic. She rarely expresses her emotions, making her a somewhat of a kūdere character, as opposed to her sister's energetic, playful personality. She loves her Younger sister Kasaida and will accompany her always due to her sis-con-like relationship towards her.

She is unable to communicate with Kasaida normally and struggles to convey her feelings properly, this results in her often making frequent sexual advances towards Kasaida. Despite her behavior, on the inside, she is sensitive, lonely, and hides a heart that can be easily hurt.

Trivia

 * Izumi (泉), meaning "spring" or "fountain", is a Japanese name and surname. It can alternately be written as 泉美, 和泉, 泉水, いずみ or いづみ.


 * Izumi looks more like the same, or older girl type, because of her characteristic for being level-headed and somewhat mature.