User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-104.7.80.176-20150721190514/@comment-104.7.80.176-20150721222500

Just to be clear they altered the memories of kiba, akeno, gasper, and kuroka so they wouldn't remember them. There was no need to alter Asia's, xenovia's, or koneko's as they were too young to remember. Plus they dislike irina for initial treatment towards asia and their brother for being devils and think of her as nothing more than Michael's pet. They are also truly remorseful for killing asia's parent's as that ended up giving her a hard life and she's done nothing but be kind to their brother. As such they truly hope she can forgive them. Plus, even though they're essentially villians they truly love their baby brother and just want him to be happy.