Library Domestic mystery The name of the isolated island is imaginary.

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Domestic Mystery
Kadokawa Bunko / Drop your weapons and get your instruments. To get out of the "Island of Puzzles". The girls in the women's high brass band disappeared all at once during the after-school practice! When the students noticed, it was a mysterious island that resembled and did not resemble the real world, but was taken over by a certain rule? Youth Survival Mystery!