Those Days I Spent as Verlaine's Cellmate

This story is also known as Yokohama's Groundhog Day. The isolation room of [redacted] is Chiyo Kamishiro's home. After living alone for three years, she gets a neighbor named Verlaine. On the day she meets her new neighbor, Chiyo Kamishiro greets him warmly. With a bang, a cloud of white smoke appears, and her new neighbor turns into a beautiful blonde woman. Chiyo Kamishiro lowers the hand she'd raised in greeting. Oh, right. Today's special ability changes people's gender. Theme: None