The "Otherworld" is a vast and perilous realm concealed from the knowledge of ordinary people. It also harbors numerous creatures that threaten any human who dares to visit. To witness its desolate yet strangely captivating environment, one must search for portals that could be located anywhere, from secret elevators to shrine entrances. After a fateful encounter with a horrific Otherworld denizen, Sorawo Kamikoshi ponders whether to persevere or give up on life. Meanwhile, Toriko Nishina scours the Otherworld in hopes of finding her friend Satsuki, whom she believes is lost somewhere within the realm. When the two cross paths, friendship blossoms. In order to acquire as much information about this obscure dimension as possible, the two travel back and forth between the real world and the Otherworld. Sorawo and Toriko's bodies are soon influenced by the Otherworld, preparing them for the many horrors to come as both strive to fulfill their goals.