Hiiro no Kakera (緋色の欠片; lit. "Scarlet Fragments") is a Japanese visual novel created by Idea Factory directed at the female market, known as an otome game. Released on July 6, 2006, for the PlayStation 2, the protagonist is a teenage girl who revisits a small village she remembers from her childhood and gets caught up in her family's history and supernatural dangers surrounding it. A thirteen episode anime adaptation by Studio Deen aired in Japan between April 1, 2012, and June 24, 2012, and was licensed in North America by Sentai Filmworks. A second season, Hiiro no Kakera: Dai Ni Shō (緋色の欠片 第二章; lit. "Scarlet Fragments: Second Chapter"), aired between October 1, 2012, and December 23, 2012. Some characters from this property are featured in the PSP game B's LOG Party, released on May 20, 2010.

Tamaki Kasuga is a teenage girl who revisits a small village she remembers from her childhood and gets caught up in her family's history and the supernatural dangers surrounding it. While walking along the hillsides waiting for the person who her grandmother sent to fetch Tamaki to the village, Tamaki comes across a small, white round object which has sticks for limbs and can talk. It runs off soon after with Tamaki chasing after it. Soon Tamaki finds herself in a place where it does not feel like the world she came from. She gets attacked by three slime creatures, and a mysterious man comes charging in to save her tells her to be quiet. After the young man, recognized as Takuma Onizaki, saves her, he walks her to the village where her grandmother is staying. Soon after her arrival she meets with her grandmother. It is later explained that she has to continue the role of the ancestor Tamayori Princess to seal the sword Onikirimaru with the help of her five Guardians.