10-saika no Osananajimi ni Kyuukonsarete imasu

34-year-old Ayane Kohara is having a rough time with dating. After being dumped yet again, her mother sends a "good match" to her home, only for her to find her childhood friend Itsuki waiting there—a guy 10 years her junior whose diapers she once changed. Despite her refusal, she reluctantly agrees to let him stay for a week, and he immediately starts making bold moves on her.