Shin Megami Tensei V: Vengeance is a turn-based role-playing game set in a post-apocalyptic Tokyo, where the protagonist is thrust into a world overrun by demons. After a mysterious event transports them to a desolate version of their city, the protagonist merges with a powerful demon and gains the ability to interact with these creatures. As they explore this dark, dangerous world, players must navigate between alliances with various factions and make choices that will shape the future of both humanity and the demon world. The game features deep demon collection and fusion mechanics. Players can recruit demons by negotiating with them during battles, and later fuse multiple demons to create stronger, more powerful allies. This system encourages players to experiment and strategize, creating a team of demons with unique skills and abilities to tackle increasingly tough challenges.