When Ryotaro and Momotaros are injured in a fight with an Imagin, Kotaro, Kamen Rider New Den-O, and his Imagin partner Teddy return to help solve the case of a stolen ticket and the mystery of a young woman's doppelganger.

Ryotaro and Momotaros got injured during a battle with an Imagin, and she ran away anywhere. Kotaro and Teddy come to help again with the request of the Owner of Denliner, but he has to investigate the case on his own because the contract between Kotaro and Teddy is complete on the day. Can this unlucky guy work without attentive buddy?