Katsuya's unnamed sister is a minor character in the series and is also the paternal aunt of Tohru. She is married and has a son and daughter older than Tohru. It's shown in their debut that they're not fond of Kyoko due to life as a yankee and are not that much kinder to Tohru. They believe that Tohru is a lot like her mother and believe she is just as reckless as her.