Not my type of humor. I can also see it now a mile away, how it will turn out that the rest of the girls at this company secretly were jealous and that's why they tried to kill Yumeko, but hew new self will make them friends or something.
I would also argue that the fact that the girl is so extremely possible after amnesia is probably not realistic. Even if it's partial amnesia, since she seems to remember at least some basic skills (like talking, and dressing up). I am not a doctor, of course, but I'd imagine for most people reaction would be way more negative, it would be scary to look inside your own head and see nothing there. Especially, when things around you tell that you had a whole life, however good or bad it was.
The new self-confidence does make sense. People generally start hating themselves because of external factors, that is others hating them. If you forget all that, it stands to reason, that you will feel confident and love yourself, since loving yourself is natural, practically a survival instinct even.
