I might be wrong but the guy on the left reminds me of ryuta (ex. 201 goushitsu)

I thought the same thing!

i wonder who the other two are
they seem familiar but i cant tell where i recognize them from

i wanna say one of them is Ken and that this was a precursor to 201 Goushitsu itself, but i just can't prove it ;w;

yeah i was also guessing ken but i think his jawline is more pronounced? idk maybe its just the lighter makeup

Looking at an earlier pic of Ken and i feel like it is him for sure