World's End Harem: Fantasia Vol. 4 (manga)

Arc and Wenna travel north, seeking a cure for the illness which has left Arc's father bedridden. However, their journey is interrupted when they come upon a band of orcs ransacking a village. It looks like a straightforward battle at first, but then they uncover the shocking truth! Meanwhile, Celine and Joanna journey into a dark dungeon in search of a hidden scroll, only to come face to face with the mythical Cockatrice. It's time to fight or die!