After a fight with Mumbo, Grian decides he needs time away from his best friend. He works on his time machine to take his mind off of it, but during testing, he accidentally takes himself back to the worst years of his life. Highschool. With the time machine missing, and Mumbo following him to Yandere Highschool, the 2 Hermits have to find their way back to Hermitcraft and survive Sam and his antics all over again. TL:DR - Grian and Mumbo are sent back to Yandere Highschool and have to find the time machine and get home. Concept inspired by this post by elizahamiltonfan: https://elizahamiltonfan.tumblr.com/post/615606172009070592/i-have-an-au-i-wanna-make-but-im-90-sure-the