Set in an otherworldly space stretching beneath the ground, this work depicts a world that feels like the “dark side of reality,” where people are disappearing one after another. “UnderWorld16” is based on the premise that 15 people have gone missing so far, and it introduces a protagonist who may be next in line to meet the same fate. Envisioning a situation where one has wandered into a parallel world, we focused on creating an atmosphere where unease and silence coexist.