Bug Computer expert sibling Shion fails to prevent a hacker from stealing Taiyo's file. Taiyo is later attacked by Ayaka Kirisaki, a disturbed needle-wielding assassin, and since hacking his file she has chosen Taiyo as her next victim for his high bounty. Before she leaves, she reveals Kyoichiro allowed her target to Taiyo since he cannot do it himself. The next day, Ayaka transfers into Taiyo's class to try kill him up close but with his new skills he narrowly survives each time, increasing her obsession with him...