Kai is Enjouji's half-brother; they share the same father, a yakuza boss, but have different mothers, both of whom have passed away. Raised in a spoiled yet emotionally turbulent childhood, Kai is somewhat of a malcontent and dislikes Kei, or at least harbors an intense sibling rivalry with him. However, he maintains a constant, albeit slightly ill-defined, relationship with his father's second-in-command, Masanori Araki. Initially, he is very attracted to Ranmaru, serving as an additional hurdle for the main protagonists to overcome. But Kai is quite young and is still undergoing maturation within the series' storyline.
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