The plot is a walking cliche. It's been done before. Actually, there's nothing wrong with a plot being done before. The problem lies more with where the writer takes the plot, and in this particular case, the writer doesn't take the plot anywhere new, so the more a reader comes across this plot being used, the more they'll be bored with this particular manga one-shot. Mind you, I do have to credit the artwork with being gorgeous, but the plot-- The plot does nothing to flesh out the characters. The reason why the guy likes messing with girls' hair is barely fleshed out, but more importantly,the writer relies too much on stereotypes to drive the plot and conflict that, in turn, removes character agency for the male character.