Sachi is a minor character in the anime series Sword Art Online. She is a member of the Moonlit Black Cats, a guild that Kirito joins temporarily. Sachi is a kind-hearted and timid girl who fears dying in the virtual world of SAO. Her close relationship with Kirito plays a crucial role in a significant emotional arc in the series. Sachi's tragic fate deeply impacts Kirito, influencing his actions and decisions throughout the story. Her character highlights themes of friendship, loss, and the harsh realities of the virtual world.