The protagonist has been giving blood to her vampiric childhood friend for years. He has always been a bit aloof, and she never knew what he was thinking, but ever since they're grown older, and she's starting working, he has become increasingly clingy and aggressive. Finally, his long pent-up true feelings burst forth, washing over her in a wave of forced pleasure. 幼馴染の吸血鬼に無理矢理抱かれた主人公。 それ以降お互いに連絡をしない生活を送っていた。 このままじゃいけないと思い、 いつも兄と自分の橋渡しをしてくれていた幼馴染の弟に相談する。 幼い頃兄弟がした約束。 頭がおかしくなりそうな快楽の中、自分自身の気持ちに気付く主人公。