Books (novels and essays) Japanese literature> Sleep on the bean

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Japanese Literature
An older sister who has gone missing. A younger sister who cannot escape from the boundary of truth or falsehood.
This is the ultimate mystery that severely shakes your "values".
Am I the only one who is wrong? The disappearance of my older sister occurred 13 years ago.
Even now that I am a university student, I still have a feeling of discomfort in my younger sister's heart.
A memory that overflows from the crack even if I press it down. And a question that is not asked. I am very glad that you come back.
But. Hey, older sister. Are you really real, Mayuko?