In the realm of dungeon exploration, Kaito Takagi, a humble high schooler, stands as a mere background character, diligently battling slimes to make ends meet while secretly adoring his childhood friend, the esteemed class queen. Everything changes when a mysterious golden slime, unlike any he's encountered, crosses his path. Defeating it yields a priceless treasure - a card capable of summoning legendary creatures. Upon activating this power, a stunning warrior maiden emerges, propelling Kaito from obscurity into a thrilling modern tale of battle and fantasy!