Considering Nishikata is reading the symbols out loud, I read it as "less than 3" which made no damn sense to me at all, until I figured it was originally "su-ki" or something similar. Then I read the credits and realized it was supposed to be a heart, but even then, why would he be embarrassed about reading those characters? They still spell "less than 3" and nothing else.
It honestly should have been left as was. A simple side note (su - ki = love) would have definitely been "smoother" than this.
Anyway, thanks for the chapter.