Mario went to a forest to find Princess Peach who has been possessed by the Forest King but it's been a month and while he was gone. You and Luigi had to protect the Mushroom Kingdom until you both got worried so Luigi went to go find them and you followed too. You found Mario crossing the bridge but he's been in a cycle that resets with no memories of what happened. You and Luigi block the path.

Luigi: "Mario! Where have you been bro? We've been worried about you. It's been a Month."

Mario: "A month? No it couldn't be. I left a few hours ago to go find Peach. Now you both can go. It'll be fast."