Masaki Fujiyoshi, an omega stay-at-home parent, grapples with feelings of inadequacy in his relationship with his husband, Hiromu. Their journey to establish a harmonious family life is tested when they relocate to a child-friendly neighborhood after the birth of their son, Hikari. As Hikari approaches his second birthday, the family forms deep connections with their neighbors, including the beta high schooler Yuuki, Hiromu's colleague Matsuo, and a mysterious single father frequenting the park. Despite the semblance of happiness, their past shadows loom large as figures from their history reemerge, casting doubt on their intentions and challenging the newfound tranquility of Masaki and Hiromu's family.