The Super Robot Taisen OE story continues with Chapter 4 set for release on Thursday. This adds mecha from six more series:
Armored Trooper Votoms: Pailsen Files
Aura Battler Dunbine
Heavy Metal L-Gaim
Mobile Suit Gundam Seed Destiny
Mobile Suit ZZ Gundam
Super Robot Taisen OE has eight chapters and the last one is slated for release in October. Right now, the first chapter is just 500 yen, half the price of the other chapters.