90화: 노비타와 도라에몽은 가족의 다이아몬드 반지가 도난당하는 것을 막기 위해 시간 여행을 떠난다.

90

Nobita leaves a photo album on the floor. The book brought nostalgia to Nobita's mother and she recalled a story about a precious diamond ring that was passed down in their family, but was stolen by two boys. Nobita and Doraemon go back in time to stop the robbers. The diamond ring turned out to be plastic and was meant for Nobita's mom to be a lesson. (Source: Wikipedia)