After a self-proclaimed recluse girl, Hijiri, heroically saves a boy but unexpectedly meets her end, she awakens in a realm of endless shopping and luxury. Now bestowed with the title of Dungeon Master, she embarks on crafting an 'Amusement Park Dungeon' to savor her afterlife in seclusion. With no regrets from her former life, she delves into the comedic journey of how a girl, two decades post-mortem, endeavors to establish a tranquil dungeon existence.