From MangaHelpers:
The story begins with regret, chaos, and desperation. Sora lives with his little sister, An, and his rather comical father. An is the soloist of her school's chorus, and Sora is an awesome cook. Sora prepares his "honki" (serious) bento for his sister's school concert.
Once An begins her solo, a mysterious force creates a rift in reality, as An's existense…
ASCII Media Works
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From Yen Press:
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