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Rawhide Young girls are easy to manipulate especially by an authority figure in this case, it is her coach/teacher. Even if she did consent once, it is still statutory rape. She is only 13-14 years old.
How can you call consent sex between two persons of the same age rape? The law has a section about consent sex between 2 persons with ages that are closed to each other, in that case it is not rape and therefore, it is not punishable by the law.
Summary:
Sex between her and her teacher even if it was consent => statutory rape and the guy will go to jail.
Sex between her and Akai, if it was consent => nothing happen as it is normal, if it was forced, the party that forced the other will go to juvie and be expelled from school.
Go and watch Law and order SVU. The show may exaggerates a bit but it was based on real law. Or you can see this chart on Japanese law and punishment