Some's hair grow faster than others'. Her bang was trimmed close to a fringe on the first few pages, and it grew longer on the last ones, not by a whole lot, but noticeable.
Even if there's no tag for it, I put it to all that the "tsundere" level with the female protagonist is, figuratively speaking, ... OVER NINE THOUSAND!
Yeah, inviting a crying brokenhearted girl into your apartment to console each other...
But you see, Sweet Vanilla love can be born from such an act, and I'm glad to see it happen.