Poor, poor kid. Takatora's going to have his hands full keeping him from hurting himself (although I assume it would be more of a way to keep Micchy calm than actually preventing injury-- he's probably more resilient even in human form).

I'm sure most of the people close to Kouta know, but I'd think he'd try to keep them from remembering. At least to avoid being pitied for giving his humanity up. And to keep the people he loves from remembering he gave it up willingly to protect them.