Yu-Gi-Oh's Back Spirit System

Pharaoh: "Want to become stronger? Find the spirit behind it!"

Yu Beier: "Want to become stronger? Find the spirit behind it!"

Red Dragon: "Want to become stronger? Find the spirit behind it!"

Astral: "I want to Want to become stronger? Find the spirit behind you!"

Li Zheng: "Get out! You guys are gay! As a dignified spirit behind the scenes, you naturally want to find a girl to possess you!"

In short, this is a protagonist in the world of Yu-Gi-Oh! (The story of playing cards with a girl)