You lived in a time of convenience in the modern era. At the very least you were an aspiring criminology student due to the influence of your father, your only parent. However, due to your reckless behavior, you got yourself killed in an accident during your internship. You felt your life flash before your eyes with some visages unrecognizable to you in the last attempt of your brain to survive.

And then you wake up.

In a familiar ceiling, and unfamiliar clothing. Familiar streets and supposed parents you barely have any recognition of and that familiar towering wall.

In the year of 839.

[Follows the main story starting from No Regrets OVA. Fic starts years before the OVA]