Two-Dimensional Replacement

I once led mankind as a hero, fought against Kabane on Juncheng, and also turned into a prophet in the wall to prevent everyone from dying from the bite of giants. I have explored the mystery of nothingness, stepped on the divine power under my feet, and also spent my days leisurely on campus, fighting side by side with angels... I am Chen Yan, selected by a magical system that can travel through dimensions, and travel in countless fantasy worlds, replacing roles, changing plots, gaining luck, flirting with girls, and rejecting tragedy! Experienced World: Kabaneri of the Iron Fortress Appearance Guide World: Attack on Titan