Tai and Joe had split up from Matt and T.K. Tai and Joe and Digimon ride on the pedal-powered swan boat. They reach an island where a huge castle is built.They go in and find Gekomon and Padomon running everywhere. The Gekomon look like frogs with a trombone growing out of their necks. And The Padomon are light navy blue creatures that look like tadpoles. The whole scene in the castle is hysterical, all the Gekomon and Padomon are running everywhere, setting up for the 'princess'. They even mistaken Tai, Joe, Agumon and Gomamon for delivering men.
They lead Tai and Joe to the 'princess', whom is Mimi! She is dressed in a lacy pink dress and wears a tiara. They can see that the princess role has gone to Mimi's head. The kids and Digimon try to persuade her to leave this place. But Mimi refuses, she likes the way she's being treated here. Then Palmon enters and the group sees she's dressed up just like Mimi! They were hoping Palmon could help them. The group refuses to leave and Mimi tells her Gekomon and Padomon to send the guests out. The kids wonder why the Gekomon and Padomon are following Mimi.
The Gekomon reveal that they needed Mimi to wake their master, Shogungekomon, whom has been asleep for years, because he lost a singing contest. The Gekomon also tell them how only a voice as beautiful as the one their master lost to can wake him again. Mimi tried but, she kept on giving excuses for not singing, and that's why the Gekomon have to treat Mimi so well. Joe and Tai decide to try and help the Gekomon. Tai, Joe, Agumon, and Gomamon try their own hands at the Karaoke. None succeed in waking the king.
In a clearing Demidevimon tells his master that he led Mimi to a place where her tag will never glow. Since she has the crest of sincerity, she won't be sincere about anyone. She'll just be spoiled all the time. And he laughs wickedly.
The guys go to Palmon for help. They then convince Palmon to try and get Mimi to sing the song into a recorder. Mimi starts, but notices the recorder cable, and has the guys thrown into the dungeon. Palmon tries to talk to Mimi, but she ignores her. Outside in the window, Sora and Biyomon's shadow can be seen.
In a dream, Mimi finds herself attacked by evil Digimon, and begs her friends as well as the Gekomon to help her.She asks Palmon to help her, but she like all the others...all refuse and dissappear. She awakens in a haze, and Sora is there encouraging her to do the right thing, and free the guys, as well as help the Gekomon. Mimi understands what she must do.
Everyone is assembled at Shogungekomon's building. Everyone wonders what's happening. The Gekomon all look around and wonder also. Then the lights appear on the stage and Mimi (in her regular clothes) rises onto the stage. She apologizes to everyone and sings her song. Tears are in her eyes, everyone is touched and forgives her. They cheer her on. Mimi's crest starts to glow. Mimi sings her song and the castle ruler wakes up, and is quite unhappy about being disturbed in his sleep. He attacks everyone. He looks just like a Gekomon but with two trombones attached to his neck and bigger too. Everyone runs out. He goes after Mimi, she cries for help and...."Palmon digi-volve to....TOGEMON!"
Togemon carries Mimi up and they both run to safety, Ikkakumon helps out too and Greymon too. All three of them attack Shogungekomon, but their not enough. Greymon digivolves to Metal Greymon and defeats Shogungekomon. The building collapses on him.
With renewed hope and caring, they all go find the others