The story centers on Koyomi Araragi, a third year high school student who has recently survived a vampire attack, and finds himself mixed up with all kinds of apparitions: gods, ghosts, myths, and spirits.
Story’s Chronological Order (from KissAnime user):
1. Kizumonogatari -Movie Prequel- (Not yet released)
2. Nekomonogatari: Kuro
5. Monogatari Series Second Season
6. Hanamonogatari should be between Kabuki and Otori
(Onimonogatari and Nekomonogatari: Shiro events happen at the same time)