Bring a Mobile Phone to Another World

Other people's systems: Ding! You have reached the full level! My system: Ding! You have been reduced to level zero! Question: "Why is my system so useless?" "Because you didn't add enough money!" "..." "The God's Eye system will not make you invincible, but it will give you one more option to help you complete your ultimate mission when you encounter difficulties." - The above is excerpted from the words of Garner, the god in the "God's Eye" system.