'File: Fool Erna' is a series of short stories about the end of 'Spy Classroom' episode 4. SPOILERS AHEAD! Erna has had a tumultuous life so far as misfortune always followed wherever she went. She wants to do everything right now so that her new spy friends do not run away from her.
Recap of Spy Classroom Episode 4
Erna joined the team twenty days before Lamplight, led by Lily and Klaus, invaded the Galgad Empire. She was later ejected from the team. Interestingly, Erna is gifted with the ability to anticipate misfortune and leverage it to her advantage. Later that night, she remembers terrible experiences from the past.
Erna meets Klaus at the market the next morning, because Erna must buy a lot of things on her own, and they fail to keep themselves safe. Klaus calls Erna quite lucky since some of the events that day may have gone horribly wrong.
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Erna asks Klaus to follow her. The duo eventually reach an isolated location away from the market where Klaus informs her that they are being followed. Later the leader of the group confronts the duo and warns him not to do anything unjustified.
The gang leader is overconfident and crushes Klaus to the ground, but Lamplight's mentor is clearly unperturbed. Klaus is furious and tells Klaus that he is not killing him because he can later prove to be a good bargaining chip. This confession is enough for the clever spy to connect the dots and understand what's happening.
The criminals were alarmed by the reports and believed that having the two of them in their possession was a huge mistake. Lamplight now had Klaus in a terrible position, and they attacked the group. Once they were able to remove them, Klaus was caught hanging in chains. Lily informs him that they have informed the police and he may surrender gracefully to him and his crew.
Although Lily has assumed that Klaus's vulnerable state would lead him to give up and accept defeat, the world's greatest spy manages to unravel all the chains and frees himself, declaring that Lamplight is no match for him. Later at Heat Haze Palace, the group considered how their mentor managed to achieve the seemingly impossible.
Another significant event that facilitated this goal was the gang leader momentarily getting angry and shooting at Klaus, who used the bullets to damage the chains even further, making it appear like a miracle.