.hack//SIGN is an anime series set in a fictional MMORPG called The World. The story follows a player named Tsukasa, who finds himself trapped in the game and unable to log out. As he navigates this virtual world, he encounters various characters, including Mimiru and Bear, who help him uncover the mysteries surrounding his situation. The series explores themes of identity, friendship, and the impact of technology on human relationships. It is known for its unique storytelling style, focusing on character development and emotional depth rather than traditional action sequences. .hack//SIGN is part of the larger .hack multimedia franchise.