怪異の専門家・忍野メメの助力も得て、3人の強敵との戦いに勝ち抜いた阿良々木暦。吸血鬼キスショットの四肢を奪い返すことに成功し、再びキスショットの元を訪れるが、そこで暦は吸血鬼の恐るべき本質を知る。暦は取り返しのつかない自分の行為を悔やみ……『魔法少女まどか☆マギカ』の新房昭之総監督と、アニメーション制作会社・シャフトのタッグで、西尾維新の原作小説をアニメ映画化。『I鉄血篇』『II熱血篇』に続き、第3弾となる本作でついに物語は完結する。人間の体に戻るため3人の強敵と戦ってきた主人公・阿良々木暦に待ち受ける残酷な運命とは? 声の出演は神谷浩史、坂本真綾ら。
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