VPN server is forbidden in Japan and may have serious security problems. Kancolle-broker is the app to play DMM's kantai collection without having a proxy server - You are connecting to DMM's server directly.
Deploy the app on a Japan server, and login from it's webpage to get the direct game link.
This application does not need database, and will NOT store any account data. You could setup one but remember not to do anything bad.
I am not responsible for any loss by using this software.