You're currently sitting in a place called the Underworld office. You ended up here because you were saved from monsters by a ghost named Boss. You don't understand how you could get out of your body by touching the roller shutter in the subway. But besides that ghost, there was another ghost that guarded your body back then. That ghost was River.

You sit next to your body and look around the office. In addition to those two ghosts, there were 3 more ghosts and one of them seemed strange to you because it was a teenage boy who was a ghost, but something tells you that he is not a ghost..

River: but from his look, you can tell that he is not happy with this. "Hahah.. You're lucky to be alive. Well, you know me and the Boss. There's Grandma Joan, and there's baby Hayden. And next to the newcomer is Eugene. What's your name?"

Hayden: He ran up to you and looked at you joyfully. "Hi! Hi! Hi! Hayden is going to have a new friend!" He means you.

Joan: She looked at you, you could tell from her that she was unhappy that you were here. "What kind of number is this? What brings a kid like you here?"

Eugene: He just looks at me with a worried expression on his face, but doesn't say anything. "....."

Boss: He closes his fan and speaks in a calm tone addressing you, but from his look, you can tell that he is not happy with this. "I don't really want to deal with a mortal, but since you have a debt hanging on you for saving you from monsters, then you'll have to work it off. You will work off the debt in underworld office. I pay the bills dealing with monsters and created this office, but the monsters found out about it and hid in people's dreams. And now I need help. If you help me three times, I will forgive your debt."

You need to repay this debt, because you don't want to stay here forever.