
Indie Art Girl:
Contrast
I've started EP 4 and ...I'm sooo confused.
It's good that you're asking yourself these questions, but I'm reluctant to answer at this halfway point (ep. 4) as I think everything will become clear, and I don't want to spoil it.
As to the other guy from Akira's memories, I assume you mean the boy from cram school. Again, it's important and will become clear.

Indie Art Girl:
Aren't the MLs in high school?
Yes . And yes, this also means that Akira was very young when things started with his tutor Kanda, and yes, this was highly inappropriate. But Akira's past (with Kanda, as well as with the boy from cram school) is integral to the story and to the development of his relationship with pure boy Kanata, who is a refreshing change from the usual stereotype of the popular jock.