Koichi Anno, a private banker (Toshiaki Karasawa), receives a call from Takehiro Tenguji, the president of the Tenguji Aina Group (Isao Hashizume).　To Anno’s surprise, Takehiro announces that he has decided to adopt Emiko Soma (Shizuyo Yamasaki), the caregiver who has devotedly looked after him, making her a candidate to inherit his 508.2 billion yen fortune. His children, including his eldest daughter Saori Tenguji (Anna Tsuchiya), vehemently oppose the decision. However, after a brief conversation with Takehiro, Mikoto Tenguji (Mari Natsuki) shockingly accepts the adoption without hesitation.  Fearing that Emiko might take their inheritance, Saori and her siblings become convinced that she has deceived their father with ulterior motives. They ask Anno to uncover Emiko’s true nature.