A girl named An Yumo was an ordinary transfer student, but she met the Candy Elf in the early morning of the transfer day. The appearance of the Candy Elf completely changed An Yumo's life. And in the new class at the new school, she unexpectedly met her childhood sweetheart and his fiancée who had deceived her. Yu Mo hated him deeply. Knowing that he is also a candy guardian, should Yumo, as a candy guardian, choose to join them or join the evil faction? What is the mission of the Candy Elf?