After you defeat certain bosses in Rune Factory 4… you can marry them. Leon is one of the bosses turned heartthrobs in Marvelous AQL’s game. Famitsu explains Leon is a lighthearted guy who teases overly serious characters, but really Leon is the kind of a guy who pays attention to other people’s needs. (So… in battle he looks for your weaknesses?)
Rune Factory and Harvest Moon games tend to have romance elements to them, but usually you skip from being friends to tying the knot. Rune Factory 4 has a dating period where you can talk to characters and give them gifts until you’re ready to confess your love. Heads up, it’s not a guaranteed that another character will say yes!
When you’re married you can see your spouse in pajamas. Famitsu has screenshots of those scenes and mentions like earlier Rune Factory titles, Rune Factory 4 will have swimsuits.