He explains to Shin-chan that he once intended to create a food item that would decrease the amount of gas released by humans (in order to prevent global warming). Shin-chan passes through a hallway filled with lasers, he then finally arrives at the doctor's lab and is ultimately greeted by the 'evil' doctor who introduces himself as Dr. After several roadblocks, Lemon tells Shin-chan that his and the doctor's body is extremely similar, and that only he can enter the doctor's laboratory since the doctor set his body as a key to enter.

Lemon and Shin-chan wear a disguise and infiltrate the facility. He also promises Shin-chan a party if he succeeds in his mission. In it, Action Mask explains Shin-chan that the evil doctor's organization is celebrating its anniversary and that tonight would be the perfect opportunity to retrieve the capsule. Shin-chan awakens in a huge balloon aeroplane where Lemon displays a short video to Shin-chan. 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. All of that is true, except for the fact that her parents are actually spies that work for a secret organization.

During dinner, Lemon explains to Shin-chan's parents (Hiroshi & Misae) that her parents are government officials and have a strict nature. En route, Lemon tells Shin-chan that he can get to meet Action Mask if he succeeds in his mission. As Lemon's escorter (a 20-year old woman) drives the two to Shin-chan's house. 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. 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'.ĭuring 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. She explains to Shin-chan that Action Mask (Shin-chan's idol) is recruiting children as spies and that him and her have been chosen to carry out an important mission for Action Mask that involves retrieving an important capsule from an evil doctor. While playing, Shin-chan is met by a young girl named Lemon Sunomono (the girl from before) who reveals herself to be a spy.

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.

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