A possible concise summary is:
Mario buys a star for his anniversary with Rosalina, but a star salesman tries to steal her by pretending to rob her and then saving her. Mario feels insecure about his size and takes some mushrooms to make him bigger. He fights off the star salesman and saves Rosalina, who tells him she loves him just the way he is.
Here are the key facts extracted from the text:
- Mario and Rosalina are celebrating their five year anniversary of knowing each other.
- Mario bought Rosalina a star as a gift.
- A star salesman and a robber try to steal Rosalina from Mario by making him look weak.
- Mario eats some mushrooms to make himself bigger and stronger.
- Mario saves Rosalina from the robber and the star salesman.
- Rosalina tells Mario that size doesn't matter and she loves him just the way he is.