Niconico not loading for me right now so I'm just going to guess at the content. the "Fake Ishtar"(aka Succubus in most Tower of Druaga games) sub-boss from the "Tower of Druaga" bonus dungeon.
at close range she'll kiss you and turn you to stone
at longer range she wiggles her tail(and ass) to shot hearts at you
she also cast a spell i think it was demons lance like Leon uses but I haven't played the game since the 90s