Can we all agree that the sister is a bitch, both in her manipulative ways and in the literal sense of the word. I hate her.
Besides that I really like the manga. It is an interesting story with an approach you don't really see often. Only the way the story is told confuses me sometimes. Like how there are switches of point of view, not only over different chapters, but even mid chapter. The same for flashbacks. I am so used to manga using dark pages to communicate that a page is a flashback, that the flashbacks in this manga always catch me off guard and it takes me about two pages to even realize that it is a flashback and what it is about.
EDIT: Lol just read a chapter where they used black pages for a flashback. Took them 30 chapters to do it.