The appearance of a mysterious little boy interrupts the quiet, predictable life shared by an artist with autism and his caring older brother.

Nobita saw a moon turned yellow last night and told his class about it but they think it's funny. Doraemon gives him the "History Explorers Club Badge" and discovers there's life on the moon. Until a new student changed him forever.

An elite gun-for-hire is forced to lay low and not kill anyone for a year, but underworld figures start to threaten his newly calm and quiet life.