Tenkuu no Hanayome Erabi

The hero is called to the residence of the absurdly rich millionaire Ludman where he is graced by the company of three beautiful bachelorettes. Inside, the owner of the astute mansion suddenly declares to him:

"Over the course of three days, you may spend all the time you desire with these ladies. Should one of them spark your interest, it would be best to choose one of them to become your bride."

In order to continue on his quest, however, the hero was in search for the "Heavenly Shield". To be able to bring this item into his possession, he has to engage in this bridal game and marry one of them!

...There he suddenly was, prompted with the most important, grueling decision of his life.

――The time allotted for the game is three days.

The (nameable) protagonist, You, has to decide with whom of the three he'll spend precious time and who will be the ultimate subject of his final decision.

[Translated from The Official website]