Ninja's Mark(忍びの卍)

The year 1630, during the reign of Shogun Tokugawa Iemitsu… One of the three ninja clans serving as internal security within Edo Castle is sabotaging His Excellency’s every attempt to sire an heir, and it’s up to roguish, loose-cannon, former Yagyu-shinkage anti-shinobi freelancer Shiinoda Toma to get to the bottom of it all. Armed with a sword that vibrates whenever a ninja power is used, Toma is knee-deep in Iga, Koga and Negoro ninja — both male and female — and assailed by outré shadow skills like body swapping, poison blood rays, and transforming courtesans into half fish-women. And when he meets his match in the form of whip-wielding kunoichi femme-fatale Kageroi, a deadly romance blooms.