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Farewell, All Those Who Have not Been Kind to Us

さようなら、私たちに優しくなかった、すべての人々

In the rural town of Agata, surrounded by mountains, high school student Shiori Nakagawa has become a truant due to bullying. One day, Mei Satou arrives at Shiori's house as a roommate. Mei, who keeps her heart closed to everyone, confides in Shiori about her true purpose: she wants to kill the seven people who drove her sister Akari to suicide three years ago.

Mei plans to use the bloodstained ritual "Okakashitsutsumi," passed down at the local shrine, to house the giant snake god "Okakashisama" within herself and carry out her revenge. On the night of the summer solstice, she successfully performs the ritual. With the god's power, Mei begins killing those involved in her sister's death one by one, with Shiori by her side. As they navigate days of vengeance and escape, the two girls gradually develop romantic feelings for each other. But Mei hides a devastating truth: anyone who performs the ritual must eventually offer their own soul to the god, meaning her death is inevitable.

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