Kotobuki Minako - Diary wa Fortissimo (Diary はフォルテシモわふぉるてしも)

Diary wa Fortissimo (Diary はフォルテシモわふぉるてしも, Diary wa Fortissimo) or Fortissimo Diary is a "Character Image Song" performed by Tsumugi Kotobuki, produced by Pony Canyon and published on 17 November 2010 within Tsumugi's Character Image Songs album. The song was sung by Tsumugi's voice actress Minako Kotobuki, written by Shouko Oomori, composed by Susumu Kawaguchi and arranged by Shigeo Komori.