Ninja Girls Vol. 1 (Kodansha, 2013)

The horn growing from Raizo's forehead is proof that he's the lost illegitimate son of the oncemighty Katana family. Now a band of loyal and lovely female ninjas devises a scheme to elevate their newfound master to greatness. But does this shy outcast have what it takes to rule the kingdom and deal with a bevy of beautiful ninja girls? Includes special extras after the story!