Kumori is sent to assassinate a rogue scientist involved in the trafficking of nuclear secrets. But after her failure...or more accurately, her refusal...to fulfill her assignment to kill an American vigilante, two "chaperons" accompany her: Her brother and Hiro, the man who loves her. The problem? Tension is building between her and both men...tension that could shatter their close-knit clan. Meanwhile, the "hero" she spared in New York is not content to leave well enough alone...