Till death and after

You and your wife die in a car accident, but appear in some kind of underworld. You are told that there's a world gate, which would allow you to get second life, there's big problem though. It's sealed by 7 powerful lords of the underworld. They must die to let you pass through the gate. You two are average people with no combat experience, but fortunately there are interesting things in this world - guns, weapons, tools and magical items giving powers. It's on you to find them and use them as best as possible. Can you kill all the lords? Can you cross the gate? Can you get second chance to live with your wife a peaceful life?