Set Comprises:

The Trail of Blood (1972): Rival gangs are at war with one another, ravaging the countryside and slaughtering anyone who defies tehm. Unfortunately for them, they messed with the wrong guy. When Jokichi, a famed wandering Yakuza soldier, tries to go straight, he quickly learns that you only leave the Underworld by getting sent to Hell! After his fellow mobsters murder his entire family, he's got only one reason to keep on living...to ensure they keep on dying!

And the Kanto Plains are full of rats that need killing'! In fact, there's three movies full of them!

The Fearless Avenger (1972): Thirsting for revenge, Jokichi rashly attempts to assassinate the evil Chogoro but ends up being captured by Yakuza. His life is spared by Boss Juzaburo, in order that the harmony of an important commemoration not be further disturbed.
Though now even more of an outcast, Jokichi is asked by another Yakuza boss, Umezo, to guard Oyuki, the wayward daughter of Juzaburo. The tragic consequences of this assignment will lead him into a deadly trap and a final confrontation with Chogoro.

Slaughter in the Snow (1973): Jokichi's success at getting revenge has resulted in a hefty price being put on his head, and it's only a matter of time before he runs into Kobunju, the master of the throwing knife, who, while he really likes Jokichi, has his professional reputation to uphold. But just because you have to kill a guy doesn't mean you can't enjoy getting to know him first and do a little male bonding by offing some villains. But in the end, there can be only one... nothing personal, mind you, it's just business.