Sephiroth being the Black Admiral...Oh geez I can just see a bad crossover of Final Fantasy and Kantai Collection.
It seems like you girls are called "Rheumatism‑class" (RIumachi), "Low Back Pain‑class" (YOutsuu) and "Rectocele‑class" (CHIokuchou‑herunia) above the ground.
In Japanese, "cho" (ちょ) is made of "chi" (ち) and small "yo" (ょ).