Kuro the Cat
Kuro is grandmother's black cat.
He was always by her side, but when she died he mysteriously dissapeared.
Ai has been searching for days.
She thinks as she sees Yuu's shadow that it is Kuro but it wasn't.
Ai said:" I wonder if all cats are like this" about Kuro's dissapearance. But Yuu insists that Kuro brought Grandmother to where Grandfather is and will return soon.