Index Corporation was the parent company of Atlus from 2006 until its restructuring in 2013. During this era, the company was credited as the developer and publisher for prominent releases, including the 2009 PSP port of Shin Megami Tensei: Persona and the 2011 puzzle-platformer Catherine. These titles represent key entries and spin-offs within the broader Shin Megami Tensei franchise.
Under Index's stewardship, development teams capitalized on the growing global footprint of the
Shin Megami Tensei universe. The 2009 PlayStation Portable release of
Shin Megami Tensei: Persona modernized the classic role-playing game for a new generation, accompanied by a specialized
Shin Megami Tensei: Persona [Soundtrack Bundle] that highlighted the franchise's distinct musical identity.
This era also saw the creation of
Catherine, a narrative-driven puzzle-platformer deeply connected to the stylistic and thematic elements of the
Shin Megami Tensei and
Persona series. Index oversaw the distribution of various regional and collector variants of this title, including
Catherine [Stray Sheep Edition],
Catherine [Love Is Over Deluxe Edition], and
Catherine [Alternate]. Beyond these specific releases, Index managed the broader portfolio of Atlus intellectual properties, ensuring the continuation of the
Etrian Odyssey and
Devil Summoner franchises. The corporate branding of Index on these packages marked a transitional phase for these cult-classic RPG series before the company's assets were ultimately sold to Sega, securing the future of these interconnected gaming universes.