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Eventually one of the apartment windows of a Mii will have a pink heart. Tap the pink heart if you see it. The Mii will ask the player if they should confess their love. The Mii will ask for advice on how to confess. You can select from the following options:  Be traditional. Be romantic. Be desperate. Be showy. Be cute. Use a line (type your own line for the Mii to use). Sing a song. Give a present. (Select a present of food, treasure, or special food for the Mii to give as a present). You can select where you want to the Mii to confess from the following locations:  Beach The Tower Park School Concert hall. Cafe. Some of these options may be unavailable depending on how much progress you have made in the game. Next your Mii will ask if they should change clothes. If you say yes, you can then select the clothes you want them to change into. Then they will go to the selected location and wait for their crush to show up. If they show up, they will do the actions you selected for them.  If it succeeds, the other Mii will become a "Sweetheart" or "Special Someone", depending on which region you are in. If it fails, you can try again later, but it will be located at the beach, and they will give a gift. If it fails a second time, they will see they're not to be and their depression goes down. If the relationship between the two isn't good enough, the other Mii will reject your Mii by not showing up. Beware! If two or three Miis like the same person, there is a chance that Mii will show up. The promised Mii will either choose the second, the first or ultimately neither. But keep in mind, three can come as well, but this is rarer. The relationship will need to develop before they can get married.  Check-in on them occasionally to see how well their relationship is going. To help the couple along, give them travel tickets so that they can spend more time together.  Travel tickets sometimes are given as a reward for helping Miis out. Keep in mind which Mii they choose to take may not be the one you want.
Tap the pink heart when you see it. Tell the Mii how to confess. Select where you want your Mii to confess. Change clothes. Check in on the couple. Give them travel tickets.