Marusessensu

A chain of malice begins now... Two beautiful sisters were born and raised in a prestigious family. The elder sister, Aki, feels confined by the environment she was born and raised in, while the younger sister, Sayu, is the mother's favorite. Then, the two receive some news... A superb co-dependency x crime suspense story unfolds between these captive girls!

(Source: Comic OGYAAA, translated)