u/Desperate-Coconut272

I am looking for an English novel titled "Miserable Family".
Characters: Haruto, Yoko, Kaori (black hair), Aoi, Haru, Haruka.
Plot: The mother had two sons, the eldest from her husband and the second from her lover. The husband killed the lover, then the mother committed suicide.
Covers: Book 1 is dark blue with a heart in the middle. Book 2 is a house in a forest.
I've checked Wattpad, Inkitt, and Webnovel but couldn't find it. Does anyone know where I can read it?