To Sir, Without Love: I'm Divorcing You, Vol. 3 (manga)

The Swangan Country Manor incident may be resolved, but Byletta has a new concern—her husband Arnald’s gaze grows sweeter by the day, and it’s rather unnerving! Where did the ruthless, cold-blooded man who proposed that outrageous wager go?! As Byletta doubts his intentions, however, their budding relationship is put to the test when figures from their respective pasts show up at the victory celebration…