This scene is so beautiful and sad and heartbreaking. How it all rushes back, all those things she noticed but tried not to pay attention to, because she’s been convinced, ever since she spoke to Narumi and saw her together with Kou, that all of it had just been delusions on her part, it’s all in her head. And it’s overwhelming, she’s literally running through the moments she shared with Kou ever since she decided to move on (you can see the bubbles pop up and then they’re everywhere, hitting Futaba’s arms and legs as she runs).
It’s really sad to see her try this hard to stop hurting over what she believes to be an unrequited love. How she’s struggling to find a way to stop thinking about it, whether it is by studying really hard or by chatting non-stop. If you paid close attention, Futaba was actually already starting to think about Kou’s actions on page 25, it’s only because Touma was able to lift her mood that she could get her mind off it.
She’s been trying to progress and look forward, yet, deep down Kou’s actions still trouble her. But she can’t let herself hope anymore and she’s trying to escape all of it, because she knows how much it hurts to think he might reciprocate her feelings to only be confronted with the fact that it’s just her own misinterpretations. Her heartbreak is beautifully portrayed.