Honestly both are good but Japan is wild if Tozawa is considered "plump", all he did was make her tits bigger and give her wider hips
she's objectively curvier now than she used to be at the start, so she is "plump"-ier, relatively speaking - though i do agree that she's never really been truly plump, except for maybe
back in the winter weight chapter.
but yeah, i can't really fault the japanese for calling tozawa's current figure "plump" - that's just what happens when your average irl japanese girl is built like a flagpole
(fr though, that's probably just the downside to the whole "east asian babyface" thing - puberty just doesn't seem to hit some of them as bad, for better or worse, and those two things seem to me like they're both just two sides of that same coin).