Ninkuu

Fusuke is searching for his mother, who was abducted when he was little. His penguin friend Hiroyuki travels by his side. The young traveler once commanded Division 1 of the Ninja Karate corps, whose warriors combine ninja techniques with karate. That small fighting force nearly brought down the imperial army before it unexpectedly disbanded, leaving the empire to win the war.

3 years after the war, the imperial army is hunting the surviving warriors, fearful of their abilities. Fusuke reunites with his former comrades Aicho and Toji as he continues looking for his mother, but their journey repeatedly brings them into conflict with soldiers and criminals. Together, they use their fighting skills to defend themselves and help the people they encounter along the way.