『俺の妹』シリーズ、伏見つかさ書き下ろしの黒猫ifルート第2巻!! 夏休みの取材合宿で「犬槙島」へとやってきたゲー研と京介たち。そこで謎の美少女、槇島悠と出会う。京介と黒猫は不思議渦巻く離島で奇妙な体験をすることに。悠の秘密とは…。そして、黒猫との恋の行方は…?
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