Actually, her father is just physically incapable of hearing the word "boy," so when she says "boyfriend," he just hears "friend." It's a medical condition; Very tragic.
Oota had such luck that his mom did not strangle him on the spot.
I did notice 2 errors:
-Oota's mom says 'my little brother's girlfriend' when referring to herself despite being a mother.
-Using 'Her' when the panel was referring to Kashiwada's father.
Wow, I'm surprised that Oota went after his mother, and that his dad is the reasonable one.
Kashiwada's brother got father's looks. Probably the only thing I like about this father