If you're leitura this I know it's because your a fã of the OHSHC. Maybe you've read the Manga, if that's the case you'll know all this. If you haven't read the mangá then this will be very informative to you.
In the mangá the story goes so much farther. I'll give the best details :)
Kaoru realizes that he, Hikaru, and Tamaki are all in amor with Haruhi. Haruhi was hanging out with Kasanoda (the dude with the red hair that knows Haruhi is a girl) and Hikaru gets really jealous. He tells Kaoru that he doesn't understand why it makes him so mad to see Haruhi with another guy. Kaoru smartly tells...