"Harumodoki (春擬き, Pseudo/False-Spring)" is the opening song for season 2. It is sung and written by Nagi Yanagi, who also sang Yukitoki. It was composed by Katsutoshi Kitagawa. It is included in the "Follow My Tracks" album. The album also contained an instrumental version of the song with no lyrics.
The song was written in conjunction with the Light Novels and Anime. Nagi Yanagi reveals she likes the main characters search for something genuine. She also states she liked the rhyming titles.
There are 2 different videos of the OP. The first version is used in episodes 1-2, and the second version is used in 3-13 and OVA Zoku.
Season 2 started April 3, 2015. The single album was released June 3, 2015.
The video may or may not work. It is often taken down due to copyright claims.