『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3巻!! ゲー研の合宿も佳境を迎え、俺と黒猫は祭りに行くことに。そこで起こる不思議な現象。消えてしまった美少女、悠が紡ぐ最後の言葉…。そして花火の下、二人が迎えるエンディングとは…!? 更に“運命の記述”を巡って巻き起こる黒猫との物語――!
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