Seshuu Jason

The semi-criminal group "REAL GOD GROUP" and their debtor, Kotegawa Pan, arrive at a lake deep in the mountains where a mass murder took place 30 years ago. Pan doesn't want to spend even five seconds with these guys, who have zero academic ability and zero ethics, but the party that takes place at the lake is the worst: loud music, chase after Pan as he runs away, and whoever catches him first gets to have sex. He'd rather die, but he's also afraid of dying. After running through the dark forest, Pan meets...

(Source: Kodansha, translated)