Is it a personality disorder ? Schizophrenia ? Or is it something else ? Honestly if that was how his mom saw him then i can't feel anything other than extreme empathy towards her , that's genuine horror , especially when you are under the same roof and no one is able to comprehense what you're going through but if that really is the case how was she able to make it sound like everything is normal to the point where she would be besides him when he wakes up every morning like there's nothing and make it seem like it's a happy go family ? Is it because she was self aware that she had mental issues and she knows that's just how he looks like to her only ? Or is seiichi the one with a personality disorder and he's in a state of hallucinating and having an imaginary mother in a psychosis state ? We lack information to decide what the heck is what so i will wait for the next chapter hoping for some better explanation . ( honestly psychosis and schizophrenia are extremely bizzare and disturbing states of mind , its like there's someone else spying on you in your brain and sometimes he likes to cut your train of thoughts to comment on something completely unrelated at all but that sound isnt self aware at all , its just there to disturb you and make you go insane with time )