Aoki's sub skills

Underground
1

SPOILER BELOW:

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Just curious as to his background and who he trains with.

2

I'm pretty sure I've seen him in Yuki Nakoi's gym, doesn't mean mch though as loads of guys just drop by.

edit Yup sherdog confirms it, he's a BJJ black belt under Yuki Nakoi (Paraestra Tokyo).

edit whoops sorry 'bout the spoiler... It's been a long day and for me it's been on TV...