A year has passed since Natsuo's fateful meeting with elite alpha twins Yuya and Tomoya, and the three are living together happily as mates. While attending the funeral for a mutual acquaintance, Natsuo runs into Kazuma, an alpha with whom he has a difficult past. This time though, Kazuma is not alone, and he pleads with Natsuo and the twins to temporarily look after his younger brother who he believes may also be an omega. In the midst of carrying out their new roles as temporary guardians, one of the twins comes to a crushing realization: he may not be Natsuo's fated mate after all!