【PC】腐り姫｜Kusarihime ~Euthanasia~

父親と妹が謎の死を遂げ、唯一生き延びた主人公は記憶を喪くしていた。

療養のため、義母に連れられて故郷の町とうかんもりに帰った彼は、失った妹に瓜二つの深紅の着物の少女、蔵女と出会う。

取り巻く家族や友人たちは、うわべでは彼の回復を望む一方、何かを隠している。罪の意識を心に潜ませた彼らの闇に忍び込み、甘美な肉欲と狂気の夢を与える蔵女。やがて身も心も崩壊させていく人々。失われた記憶を取り戻すにつれ、家族や友人の真実の姿に苦悩する主人公。それを、全て超越したかにみえる視点で見つめる蔵女。

そして古来より伝承される「腐り姫の伝説」。死んだ家族の影。全ては複雑に絡み合う。薄れた記憶と現実の境界。喪失感と恐怖、そして狂気の葛藤。果てに、赤い雪が降り積もり、世界が死の静寂に包まれる。

全ての記憶を取り戻すまでの、繰り返す4日間。

from bangumi

After the mysterious death of his father and his younger sister Juri, Itsuki, now suffering from amnesia, moves back to his hometown with his stepmother. There he meets an enigmatic young girl dressed in a crimson red kimono named Kurame, and the two soon become friends. The strange thing is, Kurame looks exactly like his younger sister Juri...

On the surface, Itsuki's family and friends all appear to be rooting for his full recovery. However, deep inside, they also seem to be burdened with secrets and guilt about the past. In the span of four days, Itsuki's memories will slowly return as he struggles between his loss and his fear of the truth, until the fourth night, when the whole world becomes blanketed under a red sheet of snow and wrapped up in the silence of death....

[Translated from the official website]