Oh, and I have a Japanese law and culture quibble. You see, "psychological" damage is of no meaning in Japanese law. Check out
the Japanese penal code It's quite an interesting read (I love to read laws) It's very easy to understand.
The relevant articles for your story are:
Article 204. (Injury)
A person who causes another to suffer injury shall be punished by imprisonment with work for not more than 15 years or a fine of not more than 500,000 yen.
Article 206. (Incitement of Injury)
A person who incites the offender in the commission of a crime at the scene of a crime proscribed under the preceding two Articles shall, even if the person does not directly cause another to suffer injury, be punished by imprisonment with work for not more than 1 year, a fine of not more than 100,000 yen or a petty fine.
Article 208. (Assault)
When a person assaults another without injuring the other person, the person shall be punished by imprisonment with work for not more than 2 years, a fine of not more than 300,000 yen, misdemeanor imprisonment without work or a petty fine.
Article 218. (Abandonment by a Person Responsible for Protection) When a person who is responsible for protection of a senile, immature, physically disabled or sick person, abandons, or fails to give necessary protection to such person, the person shall be punished by imprisonment with work for not less than 3 months but not more than 5 years.
And as for it being a fight in the court, it would be more about the punishment than the crime. In Japan, it's normally enough to convince the police, and have enough evidence. If that's the case, the judge will almost certainly condemn the accused. The Japanese police can keep a suspect locked up for over 90 days (prolongable even!) until they have to press charges and tell the suspect what they actually are. If charges are pressed, then Japan has a 90% conviction rate. There is no jury, and the judges typically only acquit in cases where it's clear the police has messed up. Usually, only the severity of the punishment is really in question at a trial. Also, there's no double jeopardy like in the USA, if the condemned appeals, the prosecution can ask a higher court for a more severe punishment. So most condemned don' t bother to appeal, as it might only see their punishment increased.
So, if the police is convinced of the suspect's guilt and has enough proof, they will press charges and the suspect being condemned is almost a forgone conclusion. They'll also try to hard-handedly extract a confession out of the suspect. If they can't find enough evidence, they'll keep the suspect as long as they can (to give them a slap on the wrist) and don't press charges and then release the suspect.
In this story the only loophole Misha's father would have would be to plead that it's merely assault and not injury, and get off with a fine. But since there were injuries, I think it might be doubtful if that would be successful. He could claim that he was only trying to correct his "delinquient daughter" who failed to show up at her mother's funeral... Which could work if the judge was very conservative, you never know in Japan... :p
However, if the judge is not too conservative, and with the school's teacher's backing, and the fact that she was injured, it should be enough to send him to jail up to 15 years. And add to that, they'd probably slap him with an abandonment charge of Misha as well. He will still be able to get softening circumstances, and if he stays calm in court, apologizes to Misha and claims that he sincerely regrets it, and makes a confession, and has some family members vouch for him, and offers financial compensation, then Misha's father will probably get off with around 2 to 5 years.
Of course, the question remains then who will pay Misha's tuition, perhaps she could press for damages...
Well I hope that was useful, make of it what you wish.
Heck, now I feel like I want to write the trial out as a fanfic.
