At 8 Hearts, you will have the option to ask an Eligible Girl for a Date in Rune Factory Frontier. A marriage proposal can be made after your character enjoys a picnic meal with the Girl but only if he has brought a Wedding Bouquet with him in his Rucksack. No proposal will be accepted if all requirements for marriage to the specific girl have not been met.
The following Summer Date at Lake Poli includes two results. In the first, Freyr proposes marriage and is accepted. The wedding follows immediately. In the second result, he chooses not to act, determined to stay single in order to experience romance with all the other Eligible Girls before he ever fixes his heart on one in particular.