In the Taisho era, Shino, a girl who can see spirits, loses her parents and is mistreated at the home of her relatives. One day, while attending a formal evening gathering merely as a supporting guest, she is suddenly proposed to by Sakuratora Tachibana, the sole heir of the prestigious Tachibana noble family. Though wary, Shino learns that Sakuratora chose her as his bride because she meets a very specific “condition.” What was supposed to be a loveless, conditional marriage unexpectedly turns into days filled with surprising sweetness and tender moments.