Reina suggests putting Yasuko, an elderly woman with poor health, into a care facility. However, Satoru strongly opposes the idea. Satoru and Yasuko share a mysterious bond, having grown close through daily care—feeding each other mouth to mouth, eventually leading to full intercourse. Upon discovering this, Reina tries seducing Satoru, using her mature allure to initiate sex, but Satoru ultimately continues choosing Yasuko.