Masaki Fujiyoshi, a stay-at-home spouse and parent, grapples with feelings of inadequacy as an omega in his loving relationship with husband Hiromu. Despite the challenges they faced to build their family, including the birth of their son Hikari and a move to a child-friendly neighborhood, Masaki still struggles with his past.
As Hikari approaches his second birthday, the family forms bonds with neighbors like beta college student Yuuki, Hiromu's colleague Matsuo, and a mysterious single father at the park. However, their idyllic life is threatened by the return of figures from their past, casting doubt on their intentions and forcing Masaki and Hiromu to confront unresolved issues.