Kai Sagano

Kai Sagano and Enjouji are half-brothers who share a father, a yakuza boss, while their mothers were different and have both died. Kai had a spoiled yet emotionally difficult childhood and is something of a malcontent. His feelings toward Kei are described either as dislike or, at minimum, an extreme sibling rivalry. His relationship with Masanori Araki, the second-hand man of Kai's father, is constant but somewhat ill-defined. Kai is initially very attracted to Ranmaru.