Lupin III: Blood Seal - Eternal Mermaid

Lupin's latest heist involves stealing a pair of jewels that hold the secret to an even greater treasure, but unfortunatly there's a lot of obstacles in Lupin's way. The smallest one involves Maki, a 14 year old girl who wants Lupin to teach her to be a thief. But what is her connection to the treasure and the mysterious girl Misa. The secrets behind the treasure reach back even into Lupin's own past. (myanimelist.net)