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.

The Subway Police of Wangsoori Station is led by Chief Inspector Ko Ji Seok. He is the best of the best, although his only goal in life is to have a stable, uneventful career. However, a serial killer, nicknamed "the Subway Ghost", strikes the Subway Police 30 Year Anniversary event. An applicant shows up for a job interview to join the team.