Hikaru softly kicked the floor. 
"Aww, man! Stuff's really different in High School, I guess"
She uttered a few suppressed curses and then blushed a little bit..., yes, just a liiiiiittle tiiiiny bit as she was being stared at.
"This is boring crap... what are you even supposed to do in a lunch break that long? You don't need that long to eat...", she exclaimed to no one in particular.
Of course, with her attitude, she didn't even care that she disturbed the students around her with that monologue of hers.
Her face turned back to the two girls eating at that table. "If you don't mind, I'll sit down here and just listen and maybe randomly barge into conversations. Why am I even asking...? I'd do it anyway" 
Hikaru laughed awkwardly and just dropped herself onto a chair tapping her cranium with her fingers.