An anime I watched as a child

I watched around 2017 but even then it felt like a 2011 to 2014 anime.it was about a guy who was playing on his psp then agreed to something in game without reading it then a girl from another realm came and asked him to save some other girls. And the girl who came from another realm was loosely clothed if ykwim .i watched from a usb my father gave me.

Thanks in advance!!