Onee-san to Neko wo Kau

One day, on the way home from school. As the boy walks through the park as usual, there was "Wanna sniff the kitty?" A mysterious onee-san, and a cat being sniffed by the onee-san. Upon hearing her story, she apparently has no home and lives in the park... Feeling sorry for her, the boy picks up the onee-san and the cat and takes them home, to which his grandmother says one thing. "You picked them up, didn't you? You take responsibility and look after them."