Born into a wealthy family, Ninoi-san was raised as a typical sheltered daughter. She married the heir of a prestigious traditional Japanese restaurant, appearing to live a happy, comfortable life. However, her daily existence became increasingly painful and suffocating due to a difficult relationship with her strict mother-in-law. One day, she overhears a conversation between her husband and his mother that chills her to the core. She learns that her husband only married her to receive financial support from her father. Shocked by this cruel truth, her heart is utterly shattered and deeply shaken.