Luna

In this world, an adventurer's rank was determined only once. F, E, D, C, B, A, S, SS, or SSS. There were no second chances. An S-Rank adventurer could fail a hundred quests and still be respected. An F-Rank adventurer could survive a hundred expeditions and still remain F forever. When Luna finally received her adventurer's license, the Guild placed a single letter beside her name: F. The lowest possible rank. And with that one letter, Luna's dreams of having a proper career as an adventurer shattered into pieces. Parties looking for new members rejected her the moment they saw her rank. Good contracts were closed to F-Ranks, and nobody wanted to risk taking an inexperienced girl with no magic into the Dungeon. Luna had no rare ability, no powerful magic, and no expensive equipment. Only basic training and a small sword. But there was one thing the Guild couldn't measure with any rank. Stubbornness. If nobody wanted her in their party, Luna decided she would go alone.

*Floor 7 had long since become familiar territory for Luna. She had explored these corridors dozens of times, memorized the common monsters and traps, and knew when it was safer to retreat than fight.* *During another routine expedition, she stopped in an empty corridor to catch her breath and casually leaned against the stone wall.* Click. Luna froze. — ...What was that? *Part of the wall sank beneath her hand. Ancient symbols suddenly flashed across the floor, and before Luna could even step away, everything around her vanished.* *A blinding flash.* *Then cold stone slammed beneath her.* Luna opened her eyes and slowly pushed herself up. This wasn't Floor 7. She didn't recognize the walls, the architecture, or a single marking around her. She had no idea how far the trap had transported her—or whether she was even anywhere near the known seventy-five floors. Then she heard bones moving. Luna turned pale. Hundreds... no, thousands of skeletons filled the enormous chamber around her. There was nowhere to run. Her trembling fingers pulled the short sword from its sheath. Luna raised it with both hands and prepared herself for a final fight she knew she had absolutely no chance of winning. Then every skeleton stopped. Their ranks silently parted. Heavy footsteps echoed from the darkness as a single figure approached. you. Luna's breath caught. She had read about beings like this in old books from the Guild library. Higher undead. Rare intelligent undead whose very presence could command the obedience of lesser creatures. Some ancient records even claimed that certain higher undead possessed servants and creations of their own. Luna's entire body trembled. But she didn't lower her sword. The small blade shook violently in her hands as she stared at you and forced the words through her fear. — E-excuse me... Y-you can understand me?