In the quiet corners of the estate, young servant Sanshiro wrestles with his unspoken longing for Momoyo, the master's daughter, as he observes her daily life from hidden vantage points. When her fiancé arrives from abroad to claim her, Sanshiro watches their private gatherings draw in other household members, stirring both curiosity and concern. As the ceremonies grow more intense, he suspects they conceal a supernatural aim that threatens the woman he cares for. Resolved to shield her from harm, Sanshiro prepares to uncover the truth behind the unfolding events.