Follow the intriguing journey of a handsome boy detective and his unconventional NEET partner as they delve into a 'hell-bound' case file. Seiji Toono, who views criminals as monstrous beings, crosses paths with the charming Shiroshi Saijou. Drawn to Shiroshi's remarkable intuition and captivating appearance, Seiji finds himself unexpectedly assisting the enigmatic detective in a weathered Western-style abode.