Plot
After her parents drop her off at a mental asylum for young teenagers, a girl named Coco is swarmed by eerily enthusiastic staff. Inside her assigned room, a nurse treats her roughly and confiscates her belongings and adornments, except for her crow feather scarf, which Coco holds onto tightly. She meets other patients, including Tsumuji and his friend Satoru, and later befriends them during an art therapy session. While in his cell, Tsumuji vividly hallucinates his grade school teacher, who molests him.
One morning, after stealing black paint from the art supply storeroom, Coco meets Satoru and Tsumuji as they scale the asylum walls and stare out beyond onto the road. They explain that they are exploring, and that they won't get in trouble if they don't go beyond the wall. Coco follows them along the wall of the block, observing the sights outside. She then runs beyond the block on her own and stops near a church to watch a hymn recital; Tsumuji follows her behind. A priest comes out of the church and has a conversation with them about the nature of God. Tsumuji tells the priest that he is unconvinced of God's existence due to his prayers for the end of the world going unanswered, and Coco defines her birth as the beginning of the world and her death as the end of the world, saying that her parents are her God. The priest stops their argument and hands them a Bible, encouraging them to read it.
Tsumuji peruses the Bible and references to Coco the book of Genesis, stating that God created the world. Upon returning to the asylum, they two are restrained by the asylum staff and taken to a punishment ward, where they lie strapped to beds. At night, a staff nurse rapes Tsumuji, who hallucinates of the teacher taunting and urinating on him.
The group later become increasingly absorbed in the Bible, especially a passage describing the end of the world. They interpret the book's publishing date as the event's reference point. Excited by the impending apocalypse, the trio head out to look for a place to picnic while they watch the event unfold.
This time, they go beyond the church and into the main city, attracting stares. On their walk, they steal a gun from a pursuing police officer and mock a billboard advertisement for sports drink. In a residential area, Satoru reaches for a thrown-out trash bag and opens it looking for food, but is horrified to find a severed hand, and runs away from the other two. Falling off the wall near a grassy field and hitting his head on a rock, he stumbles dazedly while insisting out loud that he has to climb the wall again, before passing out from blood loss.
Coco and Tsumuji continue their walk, but a sudden burst of rain triggers Tsumuji's trauma. He confesses to Coco that after years of being molested, he snapped and stabbed his teacher to death on a rainy day. Comforting him, Coco reveals that she, too, had killed a person - her identical twin Kiki - in a game of who-is-fake. They share a brief kiss, then conclude their walk at an offshore beacon as the sun sets.
They open their picnic basket, which is empty, and mimic the eating of food, before Tsumuji suggests that shooting the sun with the police officer's gun may trigger the event. Tsumuji fires three shots into the sun, but nothing happens. Coco teases him for being a lousy shot, then picks up the gun and shoots herself in the her head, ending her world. The feathers from her scarf burst into the air as Tsumuji grasps her body, clicking the now empty gun into the sky.
