Mitsuhashi Hirono♀

Hirono is the childhood friend of Michio and Minori, she is also the older sister of Wakana. She plays the role of the big sister of the three others.
Always listening to others, she is appreciated by all. She is gentle and her presence is reassuring.
She has a habit of hugging people she likes, to the delight of Michio, who has always fantasized about his incredible chest. Just like her younger sister, she noticed the change of attitude of Minori and will gladly follow Michio in his room when he comes to ask her (false) advices.
She is one of the few people Michio really loves.

She is the third "actress" of Michio, he'll makes her sleeps by drugging her and will use her breasts for a boobjob. She has no memory of it since she was sleeping under the influence of drugs.

She will later follow Michio because of a "trickery" : to don't touch and have sex with her younger sister (~lol~).
She then follows Michio in his plan for his revenge without being blackmailed.

(spoiler hidden)