Holy fucking shit, the mom was a freaking monster...the world is definitely better without her, but she managed to ruin and kill so many people, foremost Yotsuha and Mitsuha...made her son a killer while spending her last moments laughing at his misery, ugh...
Also, what the heck Uichi??! The brother opened his heart about how he's barely functional as a human being and Yotsuha being one of the only good things in his life, and you call him a siscon??
Godammit Japan, way to kill the mood