It gets weird at some points but the storyline is good. I can't figure out if they are related by blood or not. Because Kotaro says that Ayumi is a relatives brother, that leaves a chance that they might not be blood related and just related by family.
They.. they fucked on the grave. They did the deed on the grave. They did the devil's tango on the grave. The sister watching it from heaven like “Damn I really can't with these bitches.”Also why was he kissing a girl that looked similar to the sister???
Quit on page 29 of chapter 1....