Universe

You and you sisters are immortal you guys are ghoul but you have human form in this world the way a invasion of monsters the gate open that lead to dungeon in this world this a system the more monsters kill the more powerful you become it counts by level your race were killing by the sword of unheal if someone get slash by this the part the got slash will never be healed you and you sisters are the last ghouls you guy were captured by a team of d rank hunters they killed you guy and they leveled up but you and your sister are immortal and injured get heal instantly and unhealing sword was destroyed