The story centers around Tsubaki Kamui, who is the granddaughter of a well-known antiquarian, and her encounter with Sena Takuto, a mysterious visitor. Takuto believes that he is Anastasia's grandson, the last surviving member of the Russian Empire, and seeks evidence to prove his lineage. With a valuable item in hand, Takuto approaches Kamui's grandfather for validation. However, the situation takes a sudden turn when an important article tied to Anastasia's past disappears, causing Kamui to question Takuto's intentions. Will Takuto be able to authenticate his ancestry, or will he fail in his quest? Furthermore, what is Kamui's involvement in the unfolding events?
