Hanako Haibara was born and raised in the city of Tokyo. After she gets dumped by her boyfriend, while in her late 20's, she goes on blind dates to find a man to marry. Miki Tokioka was born in a province. She studied very hard and entered a prestigious university in Tokyo. She experienced difficult financial times, but she now works at an IT company. Due to a man, Hanako Haibara and Miki Tokioka meet each other.
M, a mystery writer, has a girlfriend of five years named F, who disappeared on Halloween night. When a woman comes and claims to be her sister, M begins the search for his girlfriend. Along the way, the people he meets describe a woman very unlike the F he knew.
At 14-years-old, Izuna On discovers he and his brother Motoi are both descendents of Tengu (flying goblin-like creatures of Japan folklore). Motoi has wings, which is somewhat rare among Tengu descendants, while On has the ability to communicate with animals. Due to their heritage, the two brothers live together, separated from normal society, and the story focuses on their everyday lives.
