When brothers Mario and Luigi end up with a big plumbing problem underneath their hometown in Brooklyn, they're suddenly sucked away and separated into a world beyond their wildest dreams.
Mario ends up in the Mushroom Kingdom, a beloved kingdom ruled by the beautiful and frondeur Princess Peach. But when they find out that the monstrous reptile named Bowser has taken a Power Star, along with holding Luigi and one of the princess's noble knights, (Y/n), hostage, it's up to Mario, Princess Peach, and their small but loyal sidekick Toad, to team up with their allies, and rescue their friends before Bowser takes over the world.
Mario and Luigi are starting a business called "The Plumber Brothers." They even had a little sister name Y/N that dreams of becoming a dancer, but things go downhill for her. Her friends left her to join a new group, her boyfriend cheats on her with a new girl, and she's losing some of herself. When her brothers suggested letting her come along to help with the plumbing job, she would end up in an unknown world across another universe. They learn that a bad guy named Bowser wants to rule the world and plans to marry the princess. There was a change of plans until Bowser saw someone who looked more attractive than Princess Peach.