Marina Kawano will be sining the the new ending theme song will be for Monogatari Second Season's Otorimonogatari and Onimonogatari story arcs. She has sung for the ending theme song "kieru daydream" for Nekomonogatari: Kuro, and the opening theme song "Morning Arch" for A Channel and the ending theme song "Takaramono" for Natsume Yuujinchou Shi. This new ending theme song will be composed MONACO who also composed "kieru daydream". The new single will be released on October 9, 2013.
Source: リスアニ！WEB