Kai is a red-haired high school student who stands out in the same class as Yuuya Kizami. He is a model for a popular men's magazine, known as Men's Buckle. In contrast to the quiet and behaving Yuuya, Kai is loud, foul-mouthed, and rude, often going around intimidating his fellow classmates and committing acts of vandalism; however, he's also popular among girls for his looks. He is rather selfish, shown to be willing to abandon his friends to save his own life without a second thought. He is a notorious womanizer, and it is rumored that he has as many as ten simultaneous girlfriends.