A young girl attempts to infiltrate the World Human Research Center in search of something called "Megahegaderu 2" before being informed that a "Spare Key" is required to retrieve Megahegaderu 2. While playing, Shin-chan is met by a young girl named Lemon Sunomono (the girl from before) who reveals herself to be a spy. She explains to Shin-chan that Action Mask (Shin-chan's idol) is recruiting children as spies and that he and her have been chosen to carry out an important mission for Action Mask that involves retrieving an important capsule from an evil doctor. Lemon then begins training Shin-chan, during these sessions she is contacted by her mother Lime through a device where they refer Shin-chan to as "Spare Key". During Shin-chan's training, his friends: Kazama, Nene, Masao and Bo believe that Lemon is a recruiter for a TV Show which Shin-chan has been cast in. They are suddenly attacked by the evil doctor's men and with Shin-chan's friends' help (due to their belief), Lemon is able to tackle the men back. As Lemon's escort (a 20-year old woman) drives the two to Shin-chan's house. En route, Lemon tells Shin-chan that he can get to meet Action Mask if he succeeds in his mission. During dinner, Lemon explains to Shin-chan's parents (Hiroshi & Misae) that her parents are government officials and have a strict nature. All of that is true, except for the fact that her parents are actually spies that work for a secret organization. Through her communication device, Lemon sends the signal to her mother as a sleep-inducing gas is released in the house (by the members of the secret organization Lime works for) and the entire Nohara family falls asleep due to it.
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Crayon Shin-chan: Fierceness That Invites Storm! Operation Golden Spy
Crayon Shin-chan: Fierceness That Invites Storm! Operation Golden Spy, Crayon Shin-chan Movie 19: Arashi wo Yobu Ougon no Spy Daisakusen