Woman of the Afternoon: Incite!

昼下りの女　挑発！

Also known as Hirusagari no onna: chohatsu!, 午后的女人

Yuki picks up a gay hitchhiker after leaving her husband's house following an argument. When the hitchhiker discovers his boyfriend having sex with a woman, he decides to keep traveling with Yuki. They reach a diner, which is filled with scummy Deliverance rejects who proceed to rape and torture them.