Black Butler (2008)

Set against the backdrop of Victorian London, 12-year-old Ciel Phantomhive navigates a perilous world as a young business tycoon dedicated to protecting the queen. His formidable ally is Sebastian, a demon butler whose supernatural abilities and unwavering loyalty enhance Ciel's power. Together, they confront various threats that lurk in the shadows, embroiling themselves in dark mysteries and moral dilemmas. As Ciel seeks vengeance for a tragic past, the duo's complex relationship unfolds, blending elements of horror and intrigue in a captivating tale of ambition and servitude.