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…