Misadventures of the Key Hero

A man is reborn with the options he purchased from a jumpchain document for the Rising of the Shield Hero world, 30 years before Cannon. He just ended up there, with a joke concept he created about a 'Key Hero'. To bad, now there is a 'Key Hero', and it's him. Join him as he discovers how broken his abilities can be, but at the same time learn to fight in strange ways with his 'Legendary Key'.