2ch.sc, the clone tha Hiroyuki Nishimura the mad man made is readable for Europeans but those english boards don't exist there. /dejima/ used to be the place where gaijins could post but it's been a dead board forever.
Getting a japanese VPN is easy though. Use one from the list of Tsukuba university there: https://www.vpngate.net/en/
Download the OpenVPN config file, install openvpn and fire sudo openvpn vpngate_A.B.C.D_tcp_443.ovpn
On Windows you can just use SoftEther, provided by the same people.