Hajime's reassuring gaze and soft-spoken manner were way too different from his casual demeanor that Megumi felt like her heart skipped a little. She turned around, hiding her expression by pulling down on her bangs but that was as ineffective as it was unnecessary.
For a brief moment, Keiichi saw Megumi's reaction and he was oddly confused. As far as he knows, Hajime may very well be the poorest student in their class (as mentioned before, he did background checks on everyone), and judging from that fact, there was no way Megumi would see or treat him as an equal. Nevertheless, expressions don't lie and what he just saw made him inwardly ask questions.
