During what is a rough patch in his career Mark Fischbach, a YouTube star, falls head over heels for Internet personality Sean McLoughlin. Sean also has some feelings for Mark. Sean is invited from his land of Ireland to visit mark in California for the greatest week of their lives. But what will happen to their love when Sean has to go back to Ireland? Wil the distance be too much to handle? Or does it make Septiplier stronger than ever before?