From the get-go Disgaea 3 will have charmed by it's quirky characters and fantastic gameplay evolved over the years.
Similair to the other games, you are a son of an Overlord, and intersetingly enough, you will be able to fight this Overlord early on in the game... or his hands at least. This time around, you will be in control of Mao... pronounced 'Mow' no Mayo. Anyhoo, Mao is the number uno student of the Netherworld, and knowing how the Netherworld is, one could only imagine what the number one student could be like. Well, let's just say he hasn't showed up to a single class... *phew* that must be exhausting!
According to Mao's "research" (aka any form of Manga, Video Games and Anime) a hero is someone blessed with the powers able to defeat an Overlord, provided that they stand for Love and Justice. Unsure exactly what this strange concept of Love and Justice might be, Mao decides to find a hero and extract the information... Maybe even steal his title *hehehe.* Naturally, Mao finds his target, Almaz van something something and thus our story begins.
Overall, Disgaea 3 has a very simplistic storyline to it, and it's characters seem very childish for their age... (cough cough, 1500+.) However, that's not all too bad. Everyone has a bright personality, brilliant dialogue is what makes this game come alive. That and it's incredible gameplay. On your action list you will have everything from throw-an-exploding-penguin to team combo attacks. Imagine doing 18,000,000,000 damage to a helpless humam size walking mushroom! Yes, you can do that kind of damage in this game... Heck, you can surpass level 100, 200... 700.
For those unfamiliar with the Disgaea formula, Disgaea is the kind of rpg strategy game that is based solely on a storyline, but unlike Fire Emblem and games of that nature you can do more than just buy weapons, armor and items. In Disgaea, you can sculp your dream team of killer thieves and demonic magicians. This time around, you can enter school in your homeroom create new characters (for a price,) appeal to a board of ed., form groups etc. As of right now, Disgaea 3 isn't trophy compatible, but you can purchase the add-ons.
Overall, Disgaea 3 sets the mood for a new era of rpg games. One that makes you think beyond the grid. Stay Awake! Beware of geo blocks. Fortunately, Disgaea 3 is not based off of previous game storylines, thus it is easily accesible to new-timers. Hope this helps! 10/10