My Roommate Is Reborn

On the very first day of college, a lunatic claimed that he was his own roommate, and that he had transmigrated back from the future.

I didn't believe him at first, until he pulled a Frostmourne out of his ring...

Later on, all kinds of planes will be invaded, so don't worry that the later chapters will get too dull.

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Please do not imitate.