Most of the girls actually have interesting backstories that were shunted. Cecilia had her parents death and her inheritance at a young age. Charlotte had the Dunoa arc and her mother's death. Houki has to deal with constantly moving due to witness protection. Run has divorced parents (Okay, that's pretty underwhelming). And Laura's a test tube baby super soldier. If these were focused on, they'd have a lot more depth. They were pretty much forgotten after their intro's bar the very rare mention
Going to sleep, see ya later.