Kaito Takagi is a low status high schooler. A background mob character, you might say. He is just a low-level explorer who hunts slimes every day in the dungeons that appeared all around Japan, earning pocket money while admiring his childhood friend, the class queen, from afar. One day, a golden slime he had never seen appears before him. After he defeats it, it drops an extremely rare item, worth hundreds of millions, a card that can summon mythical beings!! After he decides to activate the summon, a warrior maiden with unparalleled beauty appears.
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Rise above the mob, Kaito! A modern battle fantasy story has begun!
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(Source: Hobby Japan, translated)

Episode 12 - And Their Heroic Tale Begins

Episode 11 - In Search of the Elixir

Episode 10 - What I Can Do Now

Episode 9 - Joyful Days

Episode 8 - Bellia the Knight-Class Devil

Episode 7 - Open Campus of Adolescence

Episode 6 - The Doubly Dangerous 8th Floor

Episode 5 - Attempting the 7th Floor! And a Date?!

Episode 4 - Hidden Dungeon

Episode 3 - The Viscount-Class Devil and Sylphy's Concerns

Episode 2 - The Second Servant Card

Episode 1 - This Nobody Will Become a Hero

Gekkou

CyberAgent

Starry Cube

Toei Video

TOKYO MX

BS Nittele

Hobby Japan

Bushiroad Move

Future Leap

A Nobody's Way Up to an Exploration Hero