Utsugi Tsubaki

Her maiden name is Kamizono Tsubaki. She and her little sister Mizuki lost their parents early, and while facing hardships living in their relative's house, she looked after Mizuki.

After her arranged marriage, she has a smooth sailing life. She and her husband Kiyoshi has been married for 5 years, and has a 4 year old son named Seiichi. Mizuki also lives with them, which makes them a family of 4.

Tsubaki is a very modest housewife, nevertheless, she decided to work at Ubai after her husband got tricked into an investment scam which left them with a huge debt.