>>532210886
Koharu is ultra respectful to her senpai in Japanese version. It's something that isn't conveyed very well in global version.
Koharu has a hero complex towards Hasumi, she could never treat her like Hanako. Koharu shit talks Hanako because they're on the same level, there's no seniority

But Koharu bases her entire identity around the JTF and trying to live up to their ideals and justice, and the most righteous person she knows is Hasumi senpai.