tl;dr Hinata spread the photo of Kirisaki bullying other students. It made Makoto depressed that the chain of karma isn't ending.

Makoto noticed Kirisaki was always noticing a glare and she's scared. Always putting up a fake smile. Half a year after graduating and it still bothered him, he called Hinata over to ask her a question. Confirming if she was the one who spread the photo with Kirisaki bullying people. Somehow the picture of Hinata bullying someone circulated so he suspected Hinata, being a photographer, took it and caused Kirisaki to be bullied. Stating that he'd be really hurt if she was, indeed, the one who spread it. Hinata explained she took it and gave it to the teachers, but somehow some other kid got their hands on it. But Makoto refuted that the principal told him no teacher ever received this photo. Makoto's deduction skills said she gave the picture to Fuwa (because they were all looking for evidence to screw each other over like in the previous chapters), and that glare Kirisaki always felt was Hinata's hateful heart. Hinata then explained it was because all she had were her photography skills, only the prettier girls got all the attention. She was always looked down upon. She felt really great when she took the photo and spread it. She told Makoto to stop being so righteous because he didn't really do anything after that event.