[ele-ene-ene]

Originally Posted by zeando

mm, hairs don't match much, but comparing with the previous kanba and shouma falling, both don't exactly match too, but kanba is the most near of them

yes, but misteriuos classmate is very much like Kanba
has the same attitude with the girls

Originally Posted by zeando

and if the way to wear the uniform can be taken as an element too:
kanba's: jacket open, necktie out
shouma's: jacket closed, necktie in
shadow's: jacket open, necktie in
the shadow in OP1 probably was kanba :/

misteriuos classmate: jacket open, necktie ???

Spoiler for misterious classmate:

Originally Posted by Sol Falling

On Shouma's friend, I think he's just there for comedic effect.

most likely

but I still I have the impression that boys are three, as Triple H
I have no evidence, simple matter of symmetry

Originally Posted by Sol Falling

Not to throw any water on the second diary theories, but I just got this joke, and thought it was pretty funny. What the katakana on that book there actually say is "EROSU", or "eros" for English. Notice also the "18" label. So that's actually a porn book there that No. 1 was getting all excited over, lol.

Thanks for the clarification and translation.
Surely you are right, Esmeralda and No. 1 had the "second day" in an earlier preview

Spoiler for Esmeralda, No. 1 and the "second day":

But there are some suggestive similarities

Spoiler for momoka and tabuki: