Cute little sister or trap-bro. Gal's reactions made my day.
Thou its like mixed feelings inducing - on one hand it makes me wanna read/watch some tsundere romance that has an ending instead of waiting ages for finish on this manga, but then back there in my mind I know that the tsunderes in those "normal" mangas/animes are kinda split personality like - they are tsun for like 80% of the show, then a bit of dere shows up, then they finally become dere with a bit of tsun outbursts. Far more annoying to enjoy than having the girl switch between each damn page like this manga