Yoko (Himesaki shuri) is introduced to her whereabouts by the head of the garden at "Shirakado-ke" (The House of White Pond), a children's facility in which she grew up. It is said that the company has its first overseas training. Yoko decided to take the training with her best friend, Nashihana (Yoshiko Mizusaki), who was most intimate at the facility. That’s not the beginning of living hell.