Akane Onigiru

Akane Onigiru is the older half sister of Kasaida Onigiru and is the third youngest child along with her twin sister Akemi. She is a side character who can be seen as antagonistic at the beginning because of her love for Kasaida and not wanting to see her go or love anyone, especially a Shinsengumi. However, at the end of the series she begins to understand that Heisuke was the one who saved her and made her change her mind about killing her or wanting herself dead, which she thanked him for because it was the first time she has ever been so happy. She is best described as a Yandere.

Personality
Akane is absolutely without a doubt a pure genuine Yandere, although she seemed like an innocent girl when she first was shown in the series. She is not afraid to attack those whom seek a relationship towards Kasaida, and would most likely kill them if needed.

Her love is apparently so powerful that she is even willing to kill herself if Kasaida died. She shows a bit of Mayadere too.

Trivia

 * Akane (あかね, アカネ) is the Japanese word for 'deep red' (茜, Akane, Rubia cordifolia) and is associated with red (from the red dye made from its roots) and brilliant red.
 * Akane's name contains her signature color (aka- : red) as do most of the Oni main characters.