hate to point out a spelling mistake but on page 8 of chapter 3 the top bubble should probably say "Thousand Feathers Soar" . the word "Sore" means to hurt as in "my muscles are sore. were Soar is like "To fly through the air like a bird".
@Liquidxlax I believe it was done that way so you wouldn't get attached to any of them. Kind of why the art style seems to change right after they get transported. The artist doesn't want you to think the school setting matters and probably didn't want to put work into it. Also the artist seems much better at portraying tone rather than character designs to begin with so it makes sense.
This is a harem series through and through so most of these intro characters are fodder and won't really really play any major roles in the story till much later. Which at that point they will all be changed and the majority of them won't be around anymore