Kimiko

Being a yandere, Kimiko wants nothing but to have the protagonist for herself, while acting hostile towards Mei, Tatsumi and Shiki. Her actions range from setting the protagonist's appartment on fire so he can sleep with her, to hiring an assassin to take out Shiki, to trying to overrun Tatsumi with a stolen car, to trying to shoot Mei with a sniper rifle, to trying to lure the protagonist out so she can blow up his hideout with the girls still inside.