The TOKIMEKI-filled days that you spent with the 12 members of the Nijigasaki High School Idol Club. You loved and cherished all of those sparkling moments, each of which shone like a rainbow. But then, all of those irreplaceable memories suddenly slip away from your mind, lost. "They were so bright and warm, truly irreplaceable... But now, I doubt that I'll ever hold them again..." The members do all they can for you to regain your lost memories. The curtain rises on the story of you and the 12 members searching for the missing pieces of that TOKIMEKI! "That TOKIMEKI, once more. And forevermore."