Mar Heaven (Marchen Awakens) is a Japanese collectible card game published by Konami in April 2005, adapting the manga and anime property MÄR: Märchen Awakens Romance. The source material is a shonen manga by Nobuyuki Anzai serialized in Weekly Shonen Sunday from January 2003 to July 2006, which received a 102-episode TV anime adaptation on TV Tokyo beginning in April 2005. Konami released several product lines tied to the franchise that year, including a card game featuring the Arm Battle mechanic central to the series, in which characters wield magical weapons called ARMs. The card game joined Konami's broader portfolio of anime-licensed CCGs from the mid-2000s and was produced for the domestic Japanese market. It has been out of print since the end of the franchise's active media run.
Source: en.wikipedia.org/wiki/M%C3%84R