To Sir, Without Love: I'm Divorcing You, Vol. 2 (manga)

A brazen femme fatale...a wicked temptress fond of toying with men-these are the first things Arnald learns about the wife he's never met, Byletta. So when he receives a letter requesting divorce, Arnald responds with a wager intent on making a fool of her. After all, he's not one to take a loss, and he plans to see what this "seductress" is like for himself. But the more time they spend together, the more he learns Byletta is far from what she seems. And why is he having such trouble leaving her side...?