So, does Yoko like Hiromu? Or does she hate him? Cause in some scenes it shows she has some feelings for him but, in the rest she hates him. I really hope that this isn't a recurring thing in the later episodes. The next one shows some character development for the both Yoko and Hiromu so, maybe things will get sorted.
Also, did anyone noticed Toei changed from the regular white font to a shiny blue one for the OP? Not mention, more of the Wikipedia text.
At the end of the day, she likes Hiromu when you get past everything else. My take on it is that she felt like Hiromu ditched her and Ryuji years ago when he didn't train with them. Again, Yoko is very young so there's a lot she isn't considering, she just knows how she feels. She's being childish. Doesn't mean she's a bad person or a bad character, I think the writers are simply establishing that she's got some growing up to do.
When Hiromu came back she was sort of like "Oh so
now you're here. Why do you care all of a sudden, what about big sister?" When Hiromu talked about the promise he had made to her when she was a little girl, Yoko was honestly surprised that he remembered that as much as she did and there is a little moment where she's considering him in a new light.
..but then of course Hiromu ruins it with the comment about her face being round and pretty much both Ryuji and all the BuddyRoids give him a facepalm reaction for it.
Clearly, Hiromu's got a lot of growing up to do himself.