Kat is a mature woman in her early 40s who enjoys living an eccentric lifestyle for a woman her age. She works as a nurse at Tokyo hospital, so she has quite a bit of money and resides in a large house. From time to time she likes to visit her also rich brother Akitido and mess around with him. She loves drinking wine, partying, and flirting with men even though she’s married. As long as she doesn’t sleep with them, she doesn’t consider anything cheating.