Akai Nikkichou (赤い日記帳; Red Diary) is the only single released by the 2000 Hello! Project shuffle unit Akagumi 4. It was released on March 8, 2000. The single reached #2 on the weekly Oricon charts and charted for ten weeks. It also reached #44 on the yearly Oricon charts for 2000. The title track appears on the compilation albums Petit Best ~Ki Ao Aka~ and Hello! Project Shuffle Unit Mega Best.