Dive into the Underworld in this explosive, charming adventure where you can adjust the challenge along the way using Curse Bullets. Embark on an adventure filled with breathtaking environments, strange creatures, and bullets to save the Underworld and close the gate to the World of Darkness.

After his premature death, Mamoru awakens in the Underworld, where he meets three strangers: Mayuno, Kinya, and Beniko. Suddenly, an energetic girl named Fululu appears and explains that darkness is swallowing the Underworld. Only Mamoru and his new friends can close the gate to the World of Darkness and save the Underworld from the attack!