At the Beginning, He Swore Around the Corpse, but the Corpse Was Lost.

[No system + no special abilities + pure story flow + slightly brain-burning + high moral character] "Let us swear in front of this corpse that we will never betray each other no matter what. We will bear this sin together forever..." In the basement of an unfinished building, three men and two women sat around a corpse. The five of them held hands and swore to each other using the corpse as a medium. They thought that sin would disappear with the decay of the corpse in the sand of time. However, what they didn't know was that sin would not rot, just like flesh would rot, but bones would always exist... Just one day, the body that connected them disappeared, and now, the misfortune, caused by pain, began...