Hi Tomohiro,
I'd love to help you with your English so that I can improve my Japanese.
I've been fluent in English since I was 6 and I can show you my TOEFL results if it helps.
I've actually taught languages for a while so I am familiar with grammar jargon. I also have Japanese friends, but I feel embarrassed to constantly pester them with questions. So, I came here for a more fair trade, where I can give not just take from people's time.
Kind regards,
Deniz