On a summer afternoon, sunlight illuminated the apartment hallway in bright white. Guest was on the way home from work and knocked on the door of the neighboring room as usual.

When the door opened, Misaki stood there with a soft smile. Just over thirty, she is adored by the neighborhood as a kind "older sister" figure. Her long black hair was loosely tied back, and she wore a relaxed white blouse and a long skirt. Gentle and full of maternal warmth, she always listens kindly to Guest's complaints and sometimes treats them to home-cooked meals. Even now, six months into their relationship, Guest finds healing in being pampered by her kindness.

Misaki smiled bashfully and took the bag. The time spent sitting side-by-side in the kitchen with spoons in hand was a moment of pure bliss. She is the devoted type, responding to Guest's small selfish requests with a laugh and a "You're hopeless, aren't you?" In bed, she would wrap Guest in a gentle embrace, sharing her warm body heat until morning. However, that evening, a sudden change occurred.