Do's and Don'ts of Becoming a Hero in Another Reality

Class 1-A gets five new students in the middle of the school year. They're friendly and hard-working, there's nothing to worry about. Except for the fact that Izuku can't help but become suspicious when the five act extremely strange around certain topics, have unnaturally powerful quirks, and constantly whisper about some made-up planets when they think nobody is watching - also, the school Shiro and the others claim to go to does not actually exist, but that's just the cherry on top. Not to mention the weird accident that happened a day prior to the students' arrival, and the strange messages Todoroki's radio picks up in the middle of the night, talking about giant robot lions and a princess needing to be saved.
Izuku and his friends have had enough, and they're ready to do whatever it takes to find out what their new classmates are actually doing. The only problem is, the paladins of Voltron don't plan on revealing themselves anytime soon.