Kaiware!

Society for the Study of Communication, in reality it's little more than a hangout for the club's sole four members. Yuuma leads a nice, comfortable and most especially dull life. Day in, day out, it's always the same and he starts wondering if this is what it will be like forever. His thoughts lead to imagining what it might be like to be someone else and he and his friends start discussing who they would want to be. Of course, nobody thought it would actually ever happen. But then it inexplicably does! The four of them ending up with their bodies and minds switched among each other.