Tagiru, Taiki and Yū are taken by a Trailmon to an unknown location in DigiQuartz at the request of "a certain person" who needs to meet them. The trio Timeshifts back to the Human World and find themselves in Hong Kong. Yū guides the others around the city until they are picked up by a limo owned by the boy's older sister and fellow Xros Heart member Nene, now a well known idol. Revealing herself to be the one who sent the Trailmon to them, Nene explains that she is being stalked by a mysterious masked man with strange powers and suspects that a Digimon is behind this incident. Tagiru is the most enthusiastic to help Nene, but ends up causing more trouble by attacking and injuring a stage actor after mistaking him for the masked stalker and is forced to fill in. Just then Nene is about to shake Tagiru's hand after a job well done, when the masked man appears and attacks him. Nene's suspicions are confirmed when they find a Harpymon beside him, but the enemy proves itself too agile for them and flees. Taiki concludes that only JetMervamon's speed may cope with Harpymon's and after the masked man appears again, he and the others join forces to stall him until Nene takes a break from her concert to join the fight. However, JetMervamon is defeated by Harpymon and an enraged Tagiru asks Nene to let him borrow Sparrowmon. By DigiXrosing Arresterdramon with Sparrowmon, Tagiru defeats and captures Harpymon. The masked man is then revealed to be Nene's father, who fell under Harpymon's influence due to his anxiety of his daughter's decision to become an idol overseas. With the incident resolved, Tagiru and the others return to the Human World to watch the rest of Nene's concert.
