Tenchi and his friends are going on vacation! On Ryoko's insistence, the group is off to a hot springs resort... but not just any hot springs, they're traveling to an entire hot springs planet! However, once they get there, it turns out Ryoko doesn't actually know where the resort is. Add in a mysterious young girl named Mimiri, and it's going to be an adventure for Tenchi and his friends just trying to have a relaxing vacation.