Arya wakes up in a strange forest with no memory of how she got there. Her only companion is a little white cat who speaks into her mind.The cat says she's a Guide. An S-rank one. She doesn't take it seriously.Then she accidentally saves a Sentinel on the verge of losing control and is taken to a place called "The Lost Fort"—a base known as the graveyard of genius Sentinels.They say high-level Sentinels sent here don't live long. They say Guides here run away faster than anyone else.Then Arya arrives.She becomes the most powerful dual-abilities Guide in history. S-rank Healing Type.The Sentinels at the base notice something strange: their contamination levels are dropping. Their mental states are improving. Even their insomnia is getting better. And all of it—just because she's breathing the same air.The Sentinels go crazy. One by one, they fight to bond with her. They say it has to be her. No one else.Arya's response: She just wants to do her job well and become the strongest person there is.As for those tall, wild, painfully handsome Sentinels?...We'll see.