Ojisama to Neko

Kanda Fuyuki is a world-famous pianist who has been keeping his life busy after his wife's death. One day, Fuyuki meets an unsold cat, Fukumaru, at a pet store. Fuyuki is not good with animals but decides to get Fukumaru after being attracted by it. Since then, Fuyuki's life changes as Fukumaru starts living with him.
(Source: DramaWiki)
~~ Adapted from the manga "A Man and His Cat" (おじさまと猫) by Sakurai Umi (桜井海).