Please don't be so hostile, I'm not attacking you- I'm just showing my support for letting us be short.
Hitsugi and Kohri are canonly minors in that bath scene. That is why it grosses me out. If SEGA were to include it, I would just ignore the weird fanservice's existence like I have to do almost every time I play a JRPG. Ironically, the Persona series does it a lot.
Klariskrays is canonly an adult by her episode 4 design, which is where the screenshot is from, and look at the height difference. It's not about being a child or not, it's just about height.