Walder Johan was born in Geneva. He channels his passion for Manga into his early comic albums, including "Maximum et Minimum" and "Otakuland." He has published three children's books, teaches Manga, exhibited at MAMCO, collaborated with Amnesty International, and worked on the animated series Wakfu. In 2018, he moved to Tokyo for five years. Upon returning to Geneva, he embarked on new Manga projects.