Nice graphics. Kinda bizzare story. Also it's not original to the Switch it's a ported game from a previous Nintendo system (as are a lot of the switch games )
Spoiler alert. Basically as Mario you run around chasing Bowser to defeat him pretty standard .but here is the bizarre part. Bower is forcing the princess peach to marry him and is going around stealing stuff for the wedding and Mario's companion is a "being" that can basically possess anyone that ability is constantly utilized. so basically it's all about forced marriage and forced possession.