[mikhail21]

But it would be a good ending if Aikawa reveals that she really is a girl and had a past that she was treated as a boy. And it would be better if the reason was because she was concious that she lacked assets as a girl and is trying to get the boys' attention with what she experienced when she was a 'boy'. Well, that's for me anyway XD

Of course having schools as the manga's setting, there mostly should be a time where thay have a physical checkup. That may confirm further if Aikawa is a girl or boy.