Seishun Boku / Seishun Ore (青春 僕/青春 俺) is a collaboration single by AIR BAND and Hello! Project soloist Yaguchi Mari. It was released on March 25, 2009. The first press release contained one out of ten random trading cards featuring either Yaguchi or AIR BAND. The single reached #190 on the yearly Oricon charts for 2009. "Seishun Boku" was used as an ending theme for the show Quiz! Hexagon II in April 2009, and featured on the Petit Best 10.