In 2209, humanity created robots based on Isaac Asimov's three laws of robotics, but for the sake of military conquest, they started making robots that ignored the first law. The most advanced nations were destroyed by their own out-of-control robot armies while the other nations had to disarm their AI-controlled weaponry and disable their network. While the smaller nations survived, they lost all contact with the outside world. In 2291, the network still hasn't been restored, but civilization still exists. Rin Kagamine, a class president of Crypton High School, enjoys school life with her friends, but soon discovers that the robot war never really ended.
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This game contains examples of:
- Anti-Grinding: Enemy mobs will give less EXP if you're overleveled. The boss can also detect your level and mock you if you're too high.
- Brainwashed and Crazy: The Dominator miniboss will brainwash Rin's partner, requiring Rin to defeat the robot to free her friend. Weaker Dominators later show up as regular enemies that can inflict confusion.
- The Cavalry: For the first and only dungeon, you can only pick one other person to accompany Rin. When you fight the boss, the other two party members will join in time to even the odds.
- Charged Attack: Both player characters and enemies have the ability to spend a turn focusing, which manifests as a stackable status buff. Not only will this boost their next action, some skills require the character to be focused. However, some skills, like Rin's Stunning Blow, can remove the focus buff.
- The Computer Is a Cheating Bastard: The second and third battles of the game give the enemy a free action at the very start. If Rin isn't fully healed before these fights, she could lose these battles before they even start.
- Defend Command: Averted. There is no option to guard in battle, which makes healing and regen stacking even more important.
- EMP: The EMP Grenade slows down mechanical enemies, but has no effect on humans. Fortunately, this includes mechanical bosses like S.I.S., who generally don't have Contractual Boss Immunity.
- Harder Than Hard: The fourth difficulty, Abstract Nonsense, is stated to be harder than Hellish Yard from Corruption of Laetitia. Even the tutorial battle is capable of killing Rin in a few hits.
- Idiosyncratic Difficulty Levels: The difficulties in ascending order are Clockwork Lullaby, Ambitious, Meltdown, and Abstract Nonsense.
- Killer Rabbit: The Roombas, which are automatic vacuum machines, turn hostile and attack Rin's party. Some variants of the Roombas can whip out buzzsaws. While they're individually not as strong as the tutorial Duel Bosses, they make up for it in numbers.
- Logical Weakness: All mechanical enemies are vulnerable to the EMP grenade, which slows them down.
- Magic Music: Melodies are the game's magic, which consumes MP to inflict buffs and debuffs on an entire party. The effects of the Melodies are stronger when used on fewer targets.
- Standard Status Effects:
- Enemies can be stunned, but doing so will give them temporary immunity to that stun for a few turns.
- Human enemies can be inflicted with Bleed, which deals Damage Over Time. Robot enemies have no blood, so they leak oil instead.
- Miku can inflict sleep with one of her charged skills.
- The weaker versions of the Dominator can inflict Confusion to make a party member attack their allies.
- Three Laws-Compliant: Robots were originally programmed to not harm humans and to prevent harm to humans, obey human orders, and preserve their own existence. When the superpowers created robots without the first law, the robots rebelled against them despite still having the second law.