Honoka Furuichi

is Takayuki's little sister. She is surprised when she discovers him in a compromising position with the demon nurse Lamia.

Appearance
In contrast to her older brother, Honoka has short brown hair and olive green eyes. Her hair is tied in a side ponytail on the left side of her head, using a blue hairband.

Return to Ishiyama High School Arc
One night, Furuichi goes out to purchase pudding and tells Honoka that he will be back soon. However, Honoka becomes worried when he does not return; moreover, his cell phone is still at their house so she cannot call him. Honoka decides to call Oga and ask whether her older brother is with him. She briefly explains the situation to Oga but learns that he is not there, disappointing her.

Hidetora Tōjō
She seems to have a crush on Tojo in the amusement park in disguise.