[Update: New post with release details and Oricon chart news for the single – here – ]
Pop duo ClariS and supercell leader ryo have combined for “Naisho no Hanashi” which will be featured as the ending theme for anime Nisemonogatari. The anime is a sequel to Bakemonogatari and will begin airing January 7th.
Checkout a way too short TV commercial spot [here] at the official Nisemongatari website to get a hint of this new song.
Nisemonogatari Official website