Okay, I'm going straight to the point, I think that the missing four will be coming back to Momosu. If not all four or them, it'll be two. Who? My guesses are;
Prince Uthman and Prince Jayvyn
Why?
Spoilers...!
K26; Charles's dialogue says it all,
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K27; I think you can figure out why I think the dialogues on this page are clues that they are bringing him back. Evan saying he like Prince Jayvyn call him Principal Evan and in my opinion people who call a person of his/hers position is someone who's involve with the said person. In this situation, a principal and a student,
Feel free to comment what you think, lovely readers~