I'm here to go more into detail with the SegaVerse
The Sega Universe is made up of entirely all Sega IPs/Worlds in which they reside in a wide and varied but same cosmology
The Official Sega Heroes Twitter refers to the Events Of Sega Heroes as a Means to “save the Sega Universe” here: https://twitter.com/segaheroes/status/1063069447425060864?s=21
This is made clear in Sega Heroes
In Sega Heroes it is made clear that Sega Worlds reside in different worlds/dimensions in 0:18 to 0:49
Before I dive more into this because it is relevant, All Sega IPs and their worlds are affected by The events of this game taking hold within the Cosmology, All Atlus IPs Are Sega IPs, why? Because Sega Owns Altus and their IPs according to many sources
Sega announced that it has taken over the operations of Index Corporation, the Japanese company that owns video game developer and publisher Atlus. -
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Through the purchase, Sega now owns IPs such as the Megami Tensei series and the Persona and Etrian Odyssey franchises.
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If you still Are in Denial, the official Sega Sammy confirmed it https://www.segasammy.co.jp/english/ir/library/pdf/stockholder/2014/201403_4q_e5_kabutsu.pdf
"SEGA CORPORATION made ATLUS.CO.,LTD
its subsidiary by changing the trade name of and through company split of the game for home use business inherited from Index Corporation which has a rich track record for planning and development of contents for mobile phones and also has several strong franchise IPs in development of consumer game software including series such as Megami Tensei series, Persona series, and Etrian Odyssey series under the ATLUS brand.”
