『俺の妹』シリーズ、伏見つかさ完全書き下ろしの黒猫ifルート!! 高校3年の6月。ゲー研の部長から夏休みの取材合宿を提案された京介たち。京介は黒猫と一緒に自然たっぷりの離島で最高の夏休みを過ごしていた。謎の少女と出会ったことがキッカケで不思議な体験をする事になり…?
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