Pharmacist Yumi is sharp and heavily guarded. Coworker Takahashi resents her earlier promotion and tries every scheme to bring her down, only to be caught with evidence that he put sleeping pills in her drink. She plans a three-way confrontation at home with her husband before turning him over to police, but her spouse is unexpectedly absent. With his life about to end, Takahashi makes one final desperate move and attacks Yumi in her home.