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6. Okayama Tomoki!!
12, a real genius. He does such things like trading/selling stocks online to even hacking to earn a living (or is it his hobby) He refuses going to school saying that the level is too low for him; in fact he has history of being bullied.
He's in eps 4 of 'Uta no Oniisan', yea 1st time I see him too.