The film is extremely violent.
A character is ambushed and murdered by the villain and has her arm severed from her body with copious bloodshed.
The protagonist is choked into unconsciousness is a rough fashion.
The villain is actually shown cannibalizing the murdered character; he slices up and satays meat obviously cut from the character's body before eating it with gusto in front of the protagonist as she gags with disgust.
Many horrible things are implied in the villain's house. His house is filled with a dead animal, bloody condoms, a "help" message written on the wall, bloody shackles, knives and swords, tools such as a chainsaw and drill, a bloody cross and what appears to be the corpse of a child stuffed in the ceiling. Though none of this is shown, it's implied that the villain has been using the house to commit unspeakable acts of torture on innocent victims.
The villain is shot by a character with lots of blood.
The protagonist chops off the villain's arm with a katana (samurai sword).
The protagonist castrates the character with the sword. The castration is not shown on screen, but the penis is shown being devoured by seagulls.