Makai Wars was initially announced back in 2004 for PSP and was reannounced for PS3 in 2005 but the planned title was never released. In 2017 the game was announced again for mobile devices and was finally released in February 2018.
It was a difficult journey and therfore it's symbolic for the game's protagonist Asagiri Asagi from the Disgaea series. Asagi always wanted to be the protagonist of her own game since her very first appearance which became a running gag. She made cameo appearances in many, many games from Nippon Ichi Software and became an unofficial mascot character instead.