Introducing Kaito Takagi, an ordinary high‑school student who keeps a low profile. He spends his days delving into Japanese dungeons, slaying slime monsters for extra pocket money. Secretly, he admires his childhood friend, the class"s popular girl. One day a rare golden slime appears; after Kaito defeats it, he uncovers an incredibly valuable card that summons legendary creatures. He chooses to activate it and calls forth a breathtaking warrior maiden. Suddenly Kaito has the chance to transcend his mundane explorer routine. Prepare for an action‑packed modern fantasy tale of epic battles, and in the bustling city today.