Seishun Collection (青春コレクション; Youth Collection) is Morning Musume's 43rd single. The single was released on June 9, 2010 in a regular edition and 3 limited editions. The limited editions come with bonus DVDs. The single reached #1 on the daily chart and #3 for the weekly Oricon chart. It sold a total reported 40,865 copies. "Seishun Collection" is used as the theme song for the group's musical Fashionable, while "Tomo" is used as the theme song for the Japan Expo 2010 which Morning Musume attended as guests of honor.