Keine Kamashirasawa is a half-human, half-beast youkai from the Touhou Project series, specifically known for her role in 'Imperishable Night.' She serves as a protector and teacher in the Human Village of Gensokyo, a realm where humans and youkai coexist. As a were-hakutaku, Keine has the unique ability to consume and alter history. In her human form, she teaches history and safeguards the village from harm. Her dual nature reflects the balance between preserving history and embracing the mythical aspects of the world she inhabits.