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To get the Klaus route you have to go with Devon to find your lost keys. He'll give you a jacket so you can go outside to the forest and follow Klaus. After all of the craziness you just follow the Devon route except go to the cafeteria when he sets up the telescopes after the first day and you can choose to sleep in Klause's room. The path is really short, but Klaus is the best and so it's totally worth it.