The term 'Kokusai Gyou' refers to... a woman who targets wealthy men who have lost their wives or gone through divorce, using her charm and words to marry them and seize their inheritance. Tachibana Hinata, a widow who lost her husband a year ago. She starts working as a maid at the Saeki household... but in reality, she is a mysterious woman involved in 'Kokusai Gyou'.
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