Demon Spirit Seed Manual (Series)

On his way to a convention, Yuan Ding, an otaku, finds himself transported to another world—a fantasy world with magic and demons. After failing the entrance exam at Shuo Yue Academy, he decides to become a gardener where he learns about the fairy seed. Yuan Ding's life in another world begins, aiming to collect the fairies said to exist in the legends to change his destiny and become the protagonist of this new world.