[Ishimaru, that is very sad and Chihiro isn't sure what to say at first. Especially since you actually made an attempt at friend making, at some point.]

Mmm....I understand. ...if it helps, I'm glad to call you my friend now, Ishimaru-kun. You're a very hard worker and...a kind person, too.

[You do the right thing because...it's the right thing to do and rules and whatnot, but if poolgate taught him anything, it's that you do the right thing because you care on a level that others probably just don't understand.]

Anyone who didn't make friends with you before was just missing out.