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East Mikado… year 1492. When people become 18 years old they go through the Gauntlet Ritual to become samurai. Samurai are armed with a demon summoning program and hunt demons in secret. Only a few people know that demons exist in the world.
Tokyo is overrun by demons in Shin Megami Tensei IV. The protagonist and Samurai from East Mikado are sent here to protect the city. Atlus specifically mentions a battles between "law and chaos" and "god and demons" will take place here.
Shin Megami Tensei IV gets rid of random battles. The Symbol Encounter system puts demons on the field. Strike an enemy and you’ll get a first strike when the battle begins.
Like other Shin Megami Tensei titles you can talk to demons and invite them to your party. Shin Megami Tensei IV uses the press turn system from Shin Megami Tensei: Nocturne that rewards players that exploit enemy weaknesses with extra turns.
Demon fusing is back too. You can combine demons to make more powerful ones
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Tokyo is in ruins in Shin Megami Tensei IV and the remaining survivors have left to fend for themselves in a demon filled world. The Eight Legions Union Asura Association have been maintaining law and order from their headquarters in Roppongi. This group has been negotiating with demons to protect people. While they seem friendly, the Asura Association will punish people who disagree with their rule without any mercy.
You may remember the Cult of Gaia from other Shin Megami Tensei titles. They’re in Shin Megami Tensei IV and are based in the wealthy district of Ginza. The Cult of Gaia doesn’t care if you’re human or a demon, their philosophy is only the strong will survive kind of like the Yosuga from Shin Megami Tensei: Nocturne. The Asura Association and the Cult of Gaia are at arms with each other in Shin Megami Tensei IV.
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Charon is an ally in Shin Megami Tensei IV. If your party gets wiped out in battle you can pay Charon a fee to revive your team.
If you keep dying Shin Megami Tensei IV will give players an option to change the difficulty level, which makes the Nintendo 3DS game more beginner friendly than other entries in the series.
Planned to be released in 2013.