Strait Jacket is set an alternate history where magic was proven to exist in the year 1899. The use of sorcery spread throughout all facets of society and changed the social and technological development of the world. The location is Tristan, an urban metropolis that appears to be an amalgamation of turn-of-the-20th-century Tokyo, San Francisco, and Victorian-era London. Summary of the three-part OVA series Strait Jacket.