i was just re-reading this series and it smacked me in the face how awesome the mangaka is for creating such a hilarious cast with so many winks and nods to lots of shoujo (and sometimes even BL) tropes. the plot isn't anything amazing or groundbreaking to comment over, but the way the characters are built and interact with each other makes me smile and spit out my water laughing in every chapter.
this manga is often compared to host club, and although i agree that the character archetypes are completely similar, they are quite different in execution and that's what made the romance angle work for me in this work while it fell quite flat for me in host club (thus leading me to drop the manga once it focused entirely on that). while haruhi is completely oblivious to everything romance and sex-related, yuka is not. she might be oblivious to other's feelings for her and shares haruhi's unique wit and "straight man" role, but she is completely aware of the implications of her living under the same roof as an older, attractive man and the complications that might arise should this man no longer decide to be her older brother (as well as the confusion she would feel if this would happen). as for taichi, he's a huge, adorable and thick-skulled dork like tamaki is, but not nearly as innocent. in fact, it's proven he can be quite a perv and has some experience with women. he's aware of what his developing feelings mean, the impasse is what he is to do with them. this makes the romance much more....honest, in my opinion, and much more believable and acceptable than host club's was.
also i love taichi's friend...eiji? he's such and troll and takes everything in stride (including taichi drunk-making-out with him, lmfao). yuka's friend is also an amazing troll. and arata....is so....unexpectedly sexy. lol. now i don't know who to root for ;_;
tl;dr: my two favorite male characters crossdress so 10/10 😀
edit: THAT ENDING WAS SO DISAPPOINT. it felt rushed and the mains became all OOC with all these cornerings coming out of nowhere. at the same time it felt like nothing happened, no progression. pretty sloppy last chapter, imo.