In order for the top student Yamada Miku (Tamaki Sora) to become a good opponent of Asami Ruri (Arai Miwa), exam tutoring expert Kujo Ayaka (Koyuki) suggested that Asami Sae (Matsushita Nao) take in Miku who was alone after her mother died.However, Miku's biological father is Saying's husband Hideyo (Tanabe Seiichi). Miku hid his true life experience and began to live in Asami's house.However, her appearance is like a time bomb that may destroy the family at any time.

At this moment, Saying fell into an unprecedented dilemma.Saying concealed her life experience and grew up in a children's welfare institution run by Minamizawa Izumi (Kimura Fumino)'s parents, lied to the children that she graduated from Harvard, and was proud of her gorgeous fake experience.However, due to an incident, her secret was exposed in Sky Castle.

On the other hand, Liuli, who knew her mother's true life experience, was shocked and became more dependent on Kujo.