Following his passing, Tanaka-san became a legend as a hotel concierge in both the mortal realm and the underworld. Mei secures employment at Hotel Helheim, a once-grand establishment that holds a special place in her heart. To her surprise, Tanaka-san shows up with the desire to restore the run-down hotel to its former splendor. Mei eagerly accepts the role of his assistant and joins him in the pursuit of transforming Hotel Helheim into a top-tier destination in the underworld.