When his two abandoned nephews, Keigo and Akio, show up unexpectedly at his doorstep, Mayama Karou experiences a significant shift in his life. Despite having no prior relationship with their family, the businessman cannot bring himself to turn the boys away and instead welcomes them into his home with open arms. Together, the trio creates a loving and content family unit. But one day, Keigo surprises Karou by kissing him, leaving him to wonder whether it was an innocent display of familial affection or something more.