Twins Shion and Mion have Keiichi seeing double. But as he grows closer to Shion, their flirty friendship has Mion seeing red. When Shion and Keiichi trespass on sacred ground the night of the Cotton Drifting, a string of gruesome murders and disappearances follow. Are the legends of Oyashiro-sama's curse true? Is there a demon in Hinamizawa?

Unable to provide an alibi for the night of the Cotton Drifting, Satoshi becomes the prime suspect for the murder of his aunt! As her friend is hauled away by the police, Shion steps forward as a witness to Satoshi's whereabouts that night, exposing her true identity in the process. Shion may have saved Satoshi this time, but her actions have put her in serious danger. What will the Sonozaki family do to Shion when they learn of her association with Satoshi Hojo? And what will they do to Satoshi?

After a year at boarding school, Shion Sonozaki flees the oppressive institution and secretly returns to her hometown in the mountains, telling only her twin sister Mion of her arrival. Though the Sonozaki family has kept the sisters apart to prevent conflict over who would become the next family head, Mion and Shion have remained close - enough so that Shion can easily impersonate her identical twin. When Shion encounters Satoshi Hojo in town, he is completely taken in by her "Mion" disguise. And Shion is quite taken with him...

The demon of the Sonozaki family has found fertile soil in Shion's soul, and her fury rages out of control as she targets the last of those who are guilty of paining her beloved Satoshi. But how far is she willing to go? Will any torture or punishment fill the void left by her dear friend? Or will the sacrifices only rip greater holes in the tatters of her heart? The last pieces of the puzzle fall into place in the final volume of the Eye Opening Arc!

It's been almost a year since Natsumi and her family moved from the town of Onigafuchi. Her grandmother, a native of Hinamizawa village, fears that they will be cursed for abandoning the mountains, but Natsumi has never been happier, making new friends and enjoying school life. When a terrible gas explosion in Hinamizawa wipes out everyone in the village, her grandmother is convinced it is the wrath of the village god, Oyashiro-sama. Natsumi's family has never taken Grandmother's beliefs seriously, but her devotion to Oyashiro-sama has taken a frightening turn. Have the old woman's fanatical convictions gone too far?

Following a lead on the kidnapping of the construction minister's grandson, Officers Ooishi and Akasaka spot a secluded outpost station that shows signs of recent traffic. A little poking around brings them face to face with the boy's abductors, and the criminals aren't going down without a fight. Once the boy is recovered, the dam project is put on hold, and it seems to be a happy ending for everyone. What could Rika's warning possibly have been about...?

Rena has taken extreme measures to protect her and her father's happiness, but such drastic actions have terrible consequences. When her friends learn of her crimes, they feel no revulsion toward Rena, but rather a sense of regret that they hadn't been able to help her and avert this tragedy. But even if they had sensed Rena's desperation, would her classmates' pity have transformed itself from sentiment into action? Hadn't they had the same opportunity to prevent tragedy a year earlier, when Satoshi Hojo was suffering abuse at home, and failed to prevent his desperate act of murdering his aunt? How much can Rena afford to trust in a place like Hinamizawa?