Nobita returned to an episode 45 years ago.

What you want to ask is which episode of Nobita will be in 45 years?

It's episode 97, me from the future.

The story happened on a very ordinary day. When Daxiong came home, he found his things at sixes and sevens. The cake that had been kept as a snack was eaten inexplicably. At that time, he became very depressed and had to go out for a walk. On a meadow where they often play together, I don't know why, but he met himself 45 years later, a greasy middle-aged uncle, and they had a good chat. Daxiong proposed to be an adult and stay away from these inexplicable troubles. 45 years later, Nobita said he wanted to go back to his childhood experience. With the help of Doraemon, they successfully exchanged souls, and his uncle in his fifties became a child. All this is too precious for him.