Motokano-tachi to Yarinaoshi!?

Minato Haginouchi, heir to the prestigious Haginouchi confectionery company, is transferred to its headquarters in his third year to begin successor training. But at a company party, his father publicly names him the next president, declaring that any woman who wants to be the president's wife is free to pursue him. Suddenly, in a workplace already teeming with his ex-girlfriends, Minato becomes the unwilling target of their relentless advances!?

(Source: Shounen Gahousha, translated)