I read the raws. The last two panels on the last page should be fixed like so:
"Th-that's how it is." -> "Yes, we are." (baka-kun is responding to "So are you guys like, dating?")
"...de gozaru." -> "...You heard him." OR "...It's as he said." or some kind of affirmation to the second panel.
There are more translation errors, but they're pretty minor at worst.
Yeah, I blame author for that one. Manga is generally rather lax with speech bubbles but you can hardly even see the in the third panel it's actually the guy speaking
I was thinking he said "de gozaru" to kinda tease her and go along with her otaku ways. The "HRRGH!" afterwards was her reacting to him...or so that's how I interpreted it.
@MarqFJA87 - yes, I was re-reading this manga when I saw your comment. Maybe it made perfect sense back when I read it first time, so I did not respond.