The Diary of Modern Cinderella
Risa lost her mother when she was only 11 due to the illness she had before Risa was born. 3 years after her mother's death, her father remarried to a woman named Riko who also has a daughter named Chiyu from her previous marriage. Both Risa and Chiyu get along very well despite Chiyu is only her stepsister. Riko on the other hand, treats Risa just like her own daughter where she loves Risa as much as she loves Chiyu.
Everything seems normal until one day, Riko starts to act weird while Risa's father was transferred temporarily to Nagasaki to solve murder case there. Ever since that day, Riko always abusing them and accuse them being the messenger of The Lord of the Dead in the human world. Despite being abused frequently, Risa and Chiyu never told anyone about it because they're worried that Riko will become more violent to them and they're confused with Riko's sudden change.&nbsp;The abuse continues until Risa enters high school and Chiyu is in her final year in high school.
Without realizing, their destiny is about to change when Riko suddenly decides to kill them.