Shin Megami Tensei: Digital Devil Saga 2 is a direct sequel to the video game Shin Megami Tensei: Digital Devil Saga, directly continuing the story. It retains the "Press Turn" battle system, while altering the mantra grid, adding more enemies and adding a "Karma Ring" system to add stat boosts to your characters. Serph, leader of the Embryon, wanders aimlessly through the lifeless streets before him. In the Junkyard, his Tribe fought a gruesome war, hoping the light of heaven would relieve their suffering.

In the end, Serph’s world vanished, along with the comrades who stood by his side. All that awaited him in Nirvana were endless streets littered with the silent remains of human statues. The Promised Land was nothing but a new hell... In the future, a mysterious disease that causes the human body to slowly turn to stone is discovered. This is called the Cuvier Syndrome and is found to be originating from corrupted data emanating from the Sun, also known as God.

Unlockables

Berserker Ring
Once you beat the game, load up your clear game file and start a new game on either Normal or Hard. Play the game as normal and get to the battle where a Ghoul says he has a Power Ring on. Upon winning, you'll also receive the Berserker Ring, which allows you to always fight in Berserk Mode without having the Solar Data be 7/8 or MAX.

Hard Difficulty
Either by loading a clear save from the first Digital Devil Saga, or by completing Digital Devil Saga 2 you can select your difficulty of either Normal or Hard. Hard mode makes it harder to escape, (3/10ths the chance of normal mode) enemies hit you for 1.5 times more damage, enemies have a 1.5 times higher critical hit ratio, you hitting an enemy's weakness results in 2 times damage and allows you to face an extra secret boss.

Unlocking Heat
In order to unlock the character Heat, you must make the right choices through out DDS 1 and 2. Note that if you do choose to Unlock Heat in DDS2, Ronald would be replaced

In DDS 1:
When Heat decide to fight you in Coordinate 136, pick the first choice

- After defeating Varon Omega at Brute's Base, pick the first choice

Beat the game, after the credit roll, save the game when it asks you to. Start DDS2, when asked to load save from DDS1, load the clear data.

In DDS 2:
-At the EGG factory, pick the first choice.

-After defeating Vitra, pick the first choice.

Secrets

New Game +
Finish the game once and save your clear game file. Load the clear game file and play again, but this time, you get to keep previously earned Karma Ring, Mantra/Skill and Linkage.

Here's a cool video trailer that shows you what the game's all about: