Man , SHINPEI is friends with anyone if not everyone in the JRock music world & this's no exception x)
Here's a photo of SHINPEI which he posed together with Naoki , who's the drummer of WORLD 9 BROS.
http://ameblo.jp/naokinobrog/entry-11539791095.html
Naoki's birthday falls on 13th May which's 2 days after SHINPEI's . SHINPEI gave Naoki some CHROME HEARTS items as birthday pressies which = super expensive bling :O
In Mon's blog entry of Naoki's , he also wrote that he was glad to be born in the same month as SHINPEI . Aww bless
WORLD 9 BROS. official site -
http://w9b.jp/