A novelist receives a letter from a female university student named Kubo about strange sounds that emanate from a room in her apartment. They begin to investigate incidents involving former residents, and eventually discover the shocking truths lurking inside the building.

Taira is a disaffected youth from a seaside town reveling in violence. Enamored by his strength, Yuya joins his crusade in attacking strangers. Meanwhile, Taira's brother looks for him.

The Japanese government carries out a program to increase the birth rate in the country. Their program analyzes gene information from its residents and selects a marriage partner for them. Aoi Nisaka is a high school student. She is in a love triangle with childhood friend Yuto Shiba and Sosuke Takachiho. Sosuke Takachiho is appointed by the government to become her husband.