This show would have been better if Fumino didn't show that overly typical violence. While her character would still be quite unlikely, at least it would fit better together with Takumi by not physically attacking people (which in RL would eventually end up very badly, with the police involved or not). Like I said before, I don't actually mind Fumino's personality as long as it's balanced by Takumi who perfectly understands it, but they could have dropped the slapstick for sure because it affects Takumi as well.