Tsubasa visits her father-in-law, who has fallen into a life of drinking and self-neglect after a late-life divorce. Remembering her late father, she offers to take care of him. However, the father-in-law becomes drawn to Tsubasa's alluring figure and occasionally forces himself on her. Initially hesitant, Tsubasa gradually finds herself attracted to his intimate advances, unable to suppress her growing desires. Their relationship progresses amidst complex and conflicting emotions.