Rei , a hitman who works to kill people .
He is dangerous and everybody is afraid of him and called " Hollow ".
One day he met a high school boy , Rio .
Kind hearted and innocent , Rio saves him and entangled in the world of "Hollow "
NovelToon got authorization from Osuno Hasigawa to publish this work, the content is the author's own point of view, and does not represent the stand of NovelToon.
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