Masaki Fujiyoshi is a stay-at-home spouse and parent. He has struggled extensively with the feeling of being a burden to his loving husband, Hiromu, because of his status as an omega—a secondary gender that permits childbirth regardless of biological sex—and the challenges they encountered in establishing this domestic life. When their son, Hikari, was born, the family relocated to a neighborhood more suitable for raising children. Hikari is approaching his second birthday, and he and his parents are building meaningful connections with people in their vicinity. These individuals include Yuuki, a beta college student living next door to whom Hikari has grown quite attached; Matsuo, a friend of Hiromu’s from work; and a mysterious single father often seen wandering around the park. Despite their newly found domestic happiness, the family’s links to their past are frayed. They left certain people behind in order to build their happy family, and as those individuals begin to reappear, Masaki and Hiromu are uncertain whether their intentions are good.