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Takagi Kaito, a low-status high schooler, your typical background character, was just an ordinary explorer who hunted slimes daily in the dungeons that emerged in Japan. He earned pocket money while secretly admiring his childhood friend, the class queen, from afar. One day, he encounters a golden slime, a sight he had never seen before. After defeating it, he obtains an extremely rare item worth millions as a drop: a servant card capable of summoning mythical beings!
Determined, Kaito summons the card, and a warrior maiden of unparalleled beauty appears before him. Rise above being just a mob explorer, Kaito! A modern battle fantasy story has begun!