Dungeon Overlord: My First SSS Gacha Summon Was a Yandere

One skill. One summon every day. A dungeon waiting to rise from nothing. Freya awakens in a mysterious new world with a strange system in her eyes and a dungeon of her own. With only one ability at her disposal, she begins her journey: [Unique Skill: Gacha] [Summon anything that exists, from Rank G to Rank SSS — once every twenty-four hours.] Her daily summon could give her worthless trash… or something beyond her wildest imagination. Her very first pull gives her an SSS-ranked being. [Aria, Demonic Maid of Knowledge — Rank SSS] A perfect maid: loyal, intelligent, and willing to fulfill her master's every command. There is only one problem. Aria is a yandere. She will protect her mistress at any cost, and she will never allow anyone or anything to stand between them. Now, Freya must begin building her domain from the ground up. Dig deeper. Expand her dungeon. Summon powerful allies. Strengthen every corner of her territory, one level at a time, until a barren underground cave becomes a true dungeon worthy of fear. But she is not the only Dungeon Lord in this world. Other humans from Earth are building their own dungeons, growing their own armies, and competing for survival. The world above has already marked them as enemies, and beyond the dungeon walls, heroes are preparing their weapons, waiting for the perfect moment to break in… …and destroy everything Freya has built. Luck gave her an SSS summon on her very first try. She will need every bit of it