Souken no Dai Eiyuu ~Shin ni Aisareta Garakuta~

In this world, there are “hunters” who conquer “ruins” that have appeared from another world in search of treasure. The protagonist, a dropout named Kurogane Touma, risks his life to explore the extremely difficult ruins (dungeon) for his sick sister. There he encounters the most powerful sword and “Aion,” a supernatural being that feeds on love. The battle to save his sister and the world begins!