Ever since Maru met his new sister cat, he's been curious about the little new "creature" and following her around in the house. Her name is Hana, who was adopted into Maru's house from an animal hospital.

"Maru has been our only cat for six years. So we first had the kitty for two weeks to see if Maru and she can get along well with each other. But in only three days, the six-year old cat and the two-month young kitty started to have fun time together," wrote Mugumogu on Maru's blog.

Photos by Mugumogu.