1: a manga written by akimine kamijyo.
fictional story based around the thousand-man slayer "demon eyes kyo" mixed with hatred, revenge, power, and lots and lots of blood. many battles and comic moments, however nothing like rurouni kenshin
as some may say.
2: an extremely choppy and unworthy to the original story anime.
Samurai Deeper Kyo is a great manga, but a not-so-good anime.