Yoko Tsuno is a comics album series created by the Belgian writer Roger Leloup published by Dupuis in Spirou magazine since its debut in 1970. Through twenty-nine volumes, the series tell the adventures of Yoko Tsuno, a female electrical engineer of Japanese origin surrounded by her close friends, Vic Video and Pol Pitron (see Yoko Tsuno characters). Their adventures bring them to, among other places, Belgium (Bruges), Germany, Scotland, Japan, Hong Kong, Indonesia and also into outer space. The stories are heavily technology driven, with concepts like robot dragons (Le Dragon de Hong Kong), suspended animation (La Frontiere de la vie), time travel (La Spirale du temps and others), and even an alien species called the Vineans. Despite the often exotic settings and science-fiction plot lines, the stories generally remain realistic on the personal level between the characters and friendship, love and spirituality are some of the key themes of the series. The art is drawn in Ligne claire style, although having originally started out in the Marcinelle style. When depicting real-world settings, Leloup aspires to be as true to reality as possible, with places like Burg Katz or Rothenburg ob der Tauber depicted with almost photographic skill.