You are a rural postman. Today is your last day on the job before retirement, and you are delivering one final letter. The recipient is the lighthouse keeper atop the mountain—a stranger you have been writing to for thirty years, yet have never met.

Halfway up the slope, a sudden heart attack strikes. You collapse to the ground. When you wake, you find yourself in the "Limbo of Oblivion"—a realm where the souls of the departed linger, unable to move on to the afterlife. They are tethered here by unfulfilled obsessions, unspoken words, and unresolved regrets. As time passes, these souls gradually lose their memories and physical forms, eventually devolving into aimless, wandering "Shades".

Before you fade into one of these Shades, you must deliver that last letter to the mountaintop.