Though the intellectual property of Shin Megami Tensei belongs to Atlus, Cave Co. has worked with them to develop a Windows-based MMORPG with a MegaTen focus. Shin Megami Tensei: Imagine Online was released in early 2007 in Japan and will now be brought to North America and Europe by Aeria Games.

MegaTen Online will feature a real-time combat system with the ability to parry and block as well as attack. The weaponry used in game will feature typical MegaTen diversity, ranging from swords to guns. Another staple to the series that will be available in this MMO is demon fusion and demon team-ups. Like many other MMOs, SMT: Imagine Online will feature private party dungeons as well as public combat locations.

In porting the game to North America and Europe, it will be made available in English, French, German and Spanish. No other details have been released about the game's release other than Aeria stating that MegaTen Online "will soon be released" in a press release.