ビールを(びーるを)飲んで(のんで)酔っ払い(よっぱらい)、水瓶に(みずがめに)落ちて(おちて)「ありがたい」と悟って(さとって)死んで(しんで)いった

At the end of the story, one night the cat sneaks a drink of beer, gets drunk, and accidentally falls into a large water jar. Unable to climb out, the cat stops struggling, feeling a mysterious peace of mind—'Dying like this is not bad. Thankful, thankful'—and sinks into the water. Critiquing humans humorously, it ends in a sad yet beautiful philosophical death.