Yumiko's father and the leader of the "Tohin Railway Group" financial clique. He is also the chief director of Mihama Academy.

~!Wanting a male heir to continue his business, he became upset when his wife gave birth to Yumiko and was unable to have another child due to her frailness. He eventually had a male child with a mistress, which caused his wife to commit suicide. The child eventually got sick and died, which led to him taking Yumiko back in and raising her as the family heir. After Yumiko attacked her classmate Iida with a boxcutter, he created the Mihama academy to hide her away from the public.!~

The anime revolves around Mihama Academy, a prison-like school built to preserve fruit that has fallen too far from its tree. It is home to five female students who each have their reasons for enrolling in the academy and live their life idly within the walls of Mihama. <br>
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One day, Kazami Yuuji the institute’s first male student arrives and throws the orderly rhythm of Mihama off balance. Is Yuuji what the girls need to hold of their lives once more, or will the weight of their pasts prove too steep a wall to overcome? Or is his past even heavier than any of the others?<br>
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(Source: Crunchyroll)

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Michiaki Sakaki