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my sister's secret, kojikuna.
my sister's secret, tenkairei.
the secret of my sister, koizumi rina.
the secret of my sister, suzue monna.
■The Secret of My Sister - Refrein - Hashimot…
the secret of my sister, takahara saiko.
your sister's secret, yuu kitajima.
my sister's secret, shionrika.
my sister's secret.