Hello! Project group s/mileage"s fifth single is all about the "bu" sound. In addition to the "booing" in the its title the sound "bu" - the sound of a pig in the Japanese language - is also prominently featured in Koi ni Booing Bu!. The cute dance song is also the ending theme of a television variety show. Jacket D Edition features the B-side track Hatsukoi no Anata e.