henceforth, mio and shizuka will now only be found in the new series, "empire".
I don't think Shizuka and Kaoru are virgins, tbh. Then again, Mio and Mask are definitely virgins, so cuz they're the ships, it can still work in Virgins' Empire...at least for now, that is
Started as Virgins Empire ended up as Non-Virgins Empire