Momo and Okarun set out on their latest adventure, traveling to a hot springs town home rented by Jiji, Momo's childhood friend and former crush, with the goal to solve the mystery surrounding his family. When they arrive, strange locals derail their investigation before it can properly begin, and the group soon learns there's more lurking under the surface of the town than they could possibly have imagined. Theatrical event featuring four episodes of the anime, including the first three episodes of the second season, and an exclusive interview with series co-directors Fuga Yamashiro and Abel Góngora.

Doraemon, Nobita e i suoi amici scoprono che un dipinto rappresentante un maestoso castello europeo nasconde l'ingresso di un mondo fantastico, Artoria. Ben presto Milo e Claire, due giovani abitanti del luogo, li coinvolgono alla ricerca di un misterioso gioiello.