World War Blue
Aoi Sekai no Chuushin de · 蒼い世界の中心で
Synopsis
Segua Kingdom has been losing the war against Ninterdo Empire but the tables are turned by the appearance of a boy called Gear. All the characters are parodies of Nintendo or Sega games such as Sonic the Hedgehog, Super Mario Bros., The Legend of Zelda etc.
Studios: DAX Production, Fifth Avenue
Source: MANGA