University teacher Mitsuru Toyama hasn't aged a day since coming to Earth 400 years ago. 3 months before finally heading home, actress Tsubaki Sasahara moves in next door. Her loud midnight singing disturbs Mitsuru, who has 7 times better hearing than humans. When he goes to confront her, he realizes just how hurt she's been. Meanwhile, Tsubaki's childhood friend Hiroya Uwajima proposes to her.