After completing seven years of volunteer work overseas, the young man returns to Tokyo for a short visit to his uncle and aunt who live in an apartment in the city to say hello. Upon meeting his "Aunt Kaoru from Tokyo" for the first time in seven years, he finds her still as beautiful and intelligent as ever. "It's been a while, thank you for coming," the young man says, as his uncle and aunt kindly invite him to stay the night. However, something is on the young man's mind...