The black swindler Kaiki Deishu, who once deceived Hitagi, returns to town and spreads the incantation which cursed Nadeko before. 

Koyomi's sisters Karen and Tsukihi try to capture Deishu but... Story's Chronological Order (info from KissAnime user): 1. Kizumonogatari -Movie- 2. Nekomonogatari: Kuro 3. Bakemonogatari 4. Nisemonogatari 5. Monogatari Series Second Season --Nekomonogatari: Shiro --Kabukimonogatari --Otorimonogatari --Onimonogatari --Koimonogatari 6. Hanamonogatari should be between Kabuki and Otori 7.Tsukimonogatari (Onimonogatari and Nekomonogatari: Shiro events happen at the same time)

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