Blood Seal ~Eternal Mermaid~ is the twenty-third Made for TV Movie in the Lupin III anime franchise. It debuted on December 2, 2011 to a modest viewing audience. Made to celebrate the 40th Anniversary of the Lupin III franchise on television, the special brought a number of changes to Lupin. The first notable one is the major art style changes to the Lupin characters; past specials for the last decade had relied on designs largely derived from Shin Lupin III, the second TV series. TMS Entertainment (originally Telecom), who was involved with the early days of Lupin, was brought back to do the animation for Blood Seal, and accordingly the designs were redone to evoke the early years of the first "green jacket" Lupin series and the proto-Studio Ghibli designs used in The Castleof Cagliostro.