The whole sanatorium is in an uproar! People came to enjoy a peaceful life, but instead they have to listen to a terrifying scream coming from the forest and can’t sleep at night, watching mysterious lights flicker between the trees. Only Musya is happy—because where there are secrets, there are adventures! In the middle of everyone’s commotion, she decides to follow German—into whom almost all the girls of the sanatorium are in love. Why is he hiding in the undergrounds of a ruined count’s estate? Come on—after him! The boy nicknamed Samurai offers to accompany Musya. Adventure begins!