Miyaou Tarou ga Neko wo Kau Nante

Tarou Miyaou is a renowned novelist and ardent admirer of Niccolò Machiavelli. Use whatever means necessary to achieve a goal...Tarou has modeled his life after his beloved Renaissance philosopher. One day, he is struck by an epiphany: having a cat around would cure his stiff shoulders! Lo and behold, Tarou becomes a proud cat owner but it's not all kittens and rainbows...

(Source: MANGA Plus)