Key Jack

Key Jack summary:

*Also included is a short story called Meiou Hades published in volume 1 of this manga: Amano Yuuichirou was hit by a car, and when he next opened his eyes he found himself in a dark world full of monsters. The only living thing there seems to be a miraculous young man with snow-white hair and jet-black eyes. A short story published in "Key Jack" Vol.01 by the same mangaka... - From Storm in Heaven