Is It Wrong to Try to Pick Up Girls in a Dungeon? Memoria Freese, Vol. 4: Volume 4

Bell, Haruhime, and even Bheara Familia are united by a common goal--they don't want to lose Tarvi, who's become so special to them all. But first, they'll have to take down the Swamp King, a fearsome monster that has tormented the people of Beltane for centuries. Can they really defeat a beast said to be immortal, or will Tarvi be doomed to her fate?