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Shogun Assassin (1980)

IMDb: 7.4
1980

When the wife of the Shoguns Decapitator is murdered and he is ordered to commit suicide by the paranoid Shogun, he and his four year old son escape and become assassins for hire, embarking on a journey of blood and violent death

Lone Wolf and Cub: Baby Cart at the Rive

IMDb: 8.0
1972

Trailed by a clan of female ninja, Ogami is paid to assassinate a clan traitor accompanied by three killers known as the Gods of Death

I Will Buy You (1956)

IMDb: 7.0
1956

A talent scout moves sharply, dead set on signing a promising athlete to his team

Ninja hicho fukuro no shiro (1963)

IMDb: 6.6
1963

This is a classic early Japanese Ninja movie The Iga ninjas are a dying breed as Toyotomis rule allows Japan to experience some peace Juzo, an Iga ninja who had vowed revenge for the death of his family, is hired by a rich weapons

Shin Abashiri Bangaichi: Runinmasaki no

IMDb: 5.9
1969

After causing problems, Ken Takahara is transferred from Abashiri to the honor factory at Tanigawa Prison When the local yakuza gang is hired to destroy the factory, Takahara has to take violent action to save it