This piece of downloadable content can be triggered in the Hotel Lobby. You can play it after finishing chapter two, and will take place between chapters two and seven.
Here is the overview from the Nintendo eShop...
''Sudden tremors shake the city of Eurulm, and everyone who is gathered at the Hotel Eterna can feel them too. According to the Shikigami, the tremors were caused by the crashing of a flying ship. Aluche and her companions head to investigate, unaware of the tragedy that is awaiting them at the site…''
from GoNintendo
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