[Machine Translation] The first 4-track single with tie-ups for all songs. This single includes "Planetarium," a city pop number perfect for winter, "Tsubasa," a collaboration with New Chitose Airport, the gateway to Hokkaido, "Bubbles," a heartwarming ballad for the ending theme of Wakako Sake, and "I'll Be Myself Tomorrow," a support song for new workers in collaboration with Hokkaido Electric Power Co. This is a disc where you can enjoy the various faces of the untitled music to the fullest.