Honkai Impact 3rd: An Oath of Judah from the Start, and I’m Invincible

The story of an ordinary Honkai player who transmigrates, gets a System, and becomes extraordinary. (The author is still a student, so updates are irregular because of school. I'll try to post more on weekends. Also, my writing skills are average; I'm writing this novel just to indulge in a fantasy of my own. Please don't flame me if it's not your thing, thanks!) (The protagonist isn't invincible early on, but is basically invincible by the middle and later stages.) (Contains chuunibyou content; enter at your own risk.)