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During a time of unrest, the world is about to face a great calamity. To keep the peace of the world, the heroes of the pugilistic world form a secret organization.

20 years ago, Kei, a 23 year-old highschool teacher, fell for a student, Hitoha, a beautiful girl, but lost her from a tragic car accident. He’s now a middle aged factory worker who has just quit the job to visit Klavan in Ukraine. There lies a beautiful railway called Tunnel Of Love, where people say you can meet with your deceased beloved one. A freight transport runs once a day and it is said that the train takes someone you wish to meet.

The 4th season of Stray Kids' variety show 'The 9th'