Naisho no Hanashi is a pop song by the Japanese duo and idol unit ClariS, written by Ryo. It was released as the unit's fourth single on February 1, 2012 by SME Records. The song was used as the ending theme to the 2012 anime series Nisemonogatari. A music video was produced for the song, directed by Kazuaki Nakamura.

First season of the Monogatari Series, part 5/6. Contains the arcs Karen Bee and Tsukihi Phoenix from the Nisemonogatari light novels.
 
In Bakemonogatari, the story centered 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. However, in Nisemonogatari, we pick up right where we left off and follow Koyomi as the psychological twists delve deeper and deeper...
 
(Source: Aniplex)

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