is a Japanese anime television series adapted from an original net animation of the same name, which uploaded from 2010 to 2012. The series was produced by Yaoyorozu, and premiered from January to March 2019. It follows the survival journey of three sisters in a post-apocalyptic world overrun by mysterious red fog and akamushi, hostile red robot insects. It was the final production by Yaoyorozu before it was dissolved and merged into 8million in 2020. Characters The middle sister of the six sisters, and the protagonist of the series. Her specialties are strong eyesight, speed, and limb regeneration. She wears a rider suit with a white scarf, and has a distinctive ponytail that sticks up. Following the deaths of older sisters Ryoku, Ryo, and Riku, Rin dedicates herself to leading her remaining sisters to safety, and when necessary, sacrifices her own security to ensure their happiness. She is the quietest and most serious of all six sisters, though Ritsu says she used to have a much more cheerful and energetic personality prior to the death of their older sisters. Initially cautious and distrustful of Wakaba, Rin soon grows to respect him for his kindness and willingness to help the sisters. She is oblivious of her growing romantic feelings for him though, and thinks she is poisoned anytime she blushes around him. Her body is a vessel for the Memory Leaf, which becomes key in discovering the source of the sisters' origins and Wakaba's history with the kemurikusa. There are a few differences in Rin's character between the original ONA and the anime adaptation. She is a bit more talkative in the ONA, though she maintains her stoic personality. She is also shown to have very intense memory replays of her sisters' deaths, but this is only briefly mentioned in the anime. In terms of appearance, her eyes are a very light purple color in the ONA and she also wears a long green scarf with her rider suit. The scarf is changed to a short, white scarf in the anime, and her eyes are changed to a magenta color matching her hair. The ONA also depicts her using the powers of the green kemurikusa like a laser to shoot things. She originally had a power that allowed her to see premonitory visions of her sisters' deaths, but this was removed for the anime. The second protagonist of the series, Wakaba