Mai Hanano is devoted to caring for her senile father-in-law, doing so out of love for her husband. Day after day, she grows weary from the burden of tending to him, especially as he constantly pretends to be lost in dementia. One day, while her father-in-law sleeps in his room, her husband demands her body, leaving her emotionally unfulfilled. Witnessing her suffering, the father-in-law secretly develops feelings for her. In his final moments, he leaves her his entire inheritance—revealing a shocking truth behind his actions.