Short answers, pulled from the story.
Yana Toboso is a Japanese manga artist born in Warabi, Saitama Prefecture. She is best known for the manga Black Butler, serialized in Square Enix's Monthly GFantasy magazine from 2006, and for serving as the main creative lead on the 2020 mobile game Disney: Twisted-Wonderland.
Black Butler follows Sebastian Michaelis, a demonic butler bound by contract to serve Ciel Phantomhive, the thirteen-year-old head of a noble family. Sebastian is obligated to help Ciel take revenge on those who humiliated him after his parents were killed and his family home was burned. An anime adaptation premiered in October 2008.
Rust Blaster is a six-chapter manga published by Square Enix in 2006 and collected in a single volume. It is set at Millennium Academy, a school where vampires and humans coexist, and centers on a vampire named Al and a human boy who claims to know when the world will end.
Yana Toboso created the main concept, scenario, and character designs for Disney: Twisted-Wonderland, a 2020 mobile game made by Aniplex in collaboration with Walt Disney Japan. She also leads the creative team behind the game's main story and creates most of its current artwork.
As of 2017, Yana Toboso resides in Yokohama, Japan. She was born in Warabi, Saitama Prefecture.
Black Butler was first published in 2006 in Square Enix's Monthly GFantasy magazine.