Custom Made Fiction God

Raiden Ambrose was not a man of the Shinobi World, instead, he came from our world. Planet Earth. Looking wistfully out of the class' window he remembered the day that all of that changed... [Customisation System Activated!] What Customisation System is this?! Isn't this that Photoshop System from that Novel?! *Based on the system from Custom Made Demon King but it does change, after all, this is custom made Fiction god not demon king lol. *