i think thats why the end bit erin says if she knew she couldn't have faked it. He couldn't tell her cause everyone else would then also know he regained his memories and would ruin their plan to get rid of them all.
i think im the only one who kinda wanted kase to lose just so it fucked up the whole move and yamada would finally stand up for herself and there would be actual consequences for kase being so selfish and stupid