Tagiru's classmate, Kiichi, has begun riding on the locomotive Digimon, Locomon, and traveling to other countries every night. Eventually Kiichi and the other kids who spend all their time traveling with him start coming to school with very sleepy faces. Kiichi also starts to look thin and haggard. Worried, Tagiru and his friends decide to stop Kiichi from going on his trips. They start to board Locomon, but just then something happens! Ren, riding on Pteranomon, captures Locomon. Kiichi is stunned to see Locomon taken away and pleads for his return. Tagiru and company take Kiichi along to follow Locomon. Kiichi tries to persuade Locomon to come back to him. Will they succeed in granting Kiichi's wish and taking Locomon back from Ren?!