Manga by author Sho Yamazaki

Taro Miyao is a renowned novelist and ardent admirer of Niccol Machiavelli. Use whatever means necessary to achieve a goal... Taro 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, Taro becomes a proud cat owner but it's not all kittens and rainbows+