小野大輔
The main theme song for the spin-off ONA series, "The Melancholy of Haruhi-chan Suzumiya" is while the ending theme is , both performed by Aya Hirano, Minori Chihara, Yuko Goto, Tomokazu Sugita and Daisuke Ono. A single of the two songs was released on April 20, 2009. Three singles accompanying the other spin-off ONA series, "Nyoro-n Churuya-san", were released, featuring songs sung by Yuki Matsuoka.