Kouta Kawamura, a salaryman who despises complications, finds solace in a black stray cat that frequents his doorstep—his only exception to the rule. However, his routine is disrupted when he encounters a black-haired boy who mysteriously resembles his beloved feline friend. Moved by the boy's sudden collapse, Kouta impulsively welcomes him into his home. How will Kouta navigate this unexpected twist and reconcile it with his desire for a tranquil existence? This tale of unlikely connections explores the unfolding bond between Kouta and the enigmatic boy, delving into themes of companionship and the unanticipated disruptions that can bring new meaning to one's life.