JessicaFisher's favorite manga. Written by CLAMP quite a few years ago,
TokyoBabylon covers the story of Sumeragi Subaru, his twin sister Hokuto, and their friend Sakurazuka Seishirou. It involves lots of funky costumes, mystery solving, magic, murder . . . angst. It has a very dramatic and angsty ending, and the story is later continued in CLAMP's current series, X (known in the US as X/1999).