Is this a second omake at the end of vol. 15? Because I don't think there has been a volume with two six-page omakes bundled together - almost as long as one normal chapter.
About the chapter itself: I'm surprised that Dad Kenichi got to meet Hata before the rest of the regular faces (Chitose, Sakura & Tama) but with the now-current RPG arc taking place at the Kazama household it's a matter of time.
Hata is a good foil to Takao. Both are busty captains of their game creation clubs, who got beaten at a game contest by Kenji using his wits and developed feelings for him after he (reluctantly) helped them out of their troubles. But Takao is clumsy, quick to panic, a bit on the dumb muscle side, unaware of the charm of her bust, and often expresses her jealousy through pouts and keeps it to herself. Hata on the other hand is sly, shrewd, fond of tricks, deliberately uses her bosom to her advantage, and expresses her jealousy openly (the girl's just short of saying it out loud).