Takahashi Daichi (高橋大智), a normal Japanese journalist, hikes at Mt. Maruyama in Hokkaido until he accidentally find a mysterious fissure in the air, and he got suck in.

Then, he met 'Yuki-Chan,' a mysterious young girl, guiding him back to where he belong.

Along the way, Daichi meet unique individuals. Will he come back home safely and peacefully?