Chrom really needs to stop hanging out with Anna, the merchant in Fire Emblem: Awakening that also pops up in other Fire Emblem games. When Anna brought Chrom to a beach enemy soldiers showed up and spoiled the party.
In the next downloadable story, Hidden Hot Springs Bonds, Anna invites Chrom to a far away hot springs and suddenly undead soldiers rise from from the grave. You’ll see some characters dressed in a yukata during event scenes. This map also has a special scene with My Unit, the Fire Emblem: Awakening character that represents you.