A team of assassins exacts a bloody retribution on Joe Logan – a former ninja who escaped his clan – and his family for betraying their ancient code. Rising from his seeming "death," Joe will re-emerge as his former self – Ninja Kamui – to avenge his family and friends and bring down the very clan that made him.

Awakened into a world where humanity has been petrified, scientific genius Senku and his brawny friend Taiju use their skills to rebuild civilization.