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About : Birthday: March 17th Blood Type: A Height: 5.5 ft Weight: 110 lbs Birthplace: Osaka Kai is Enjouji's half-brother, having the same father, the yakuza boss, but different mothers, both of whom haved passed away. Having a spoiled yet emotionally difficult childhood, Kai is somewhat of a malcontent and dislikes Kei or at least has an extreme sibling rivalry with him! However, he has a constant although a bit ill-defined relationship with his father's second-hand man, Masanori Araki. Initially he i...