For those who havent seen the anime, here's general the idea:

There are 2 worlds basically: First, [i]Tetra-Heaven[/i], where all gods, goddesses, angels, demons, and other mythological beings reside; second, [i]Septpia[/i], the human plane. Once in a while, 'Foreigners' from Tetra-Heaven go to Septpia to amuse themselves by plaguing humans with their presense, causing mass destruction and spreading [i]Paradox Sickness[/i] (anyone who gets Paradox Sickness, well, they get sick). ALCA is a special agency who acts as a first line of defense from assaults by these said Foreigners. [i]Logicalists[/i] are people who works under ALCA and possesses the ability to [b]Tranceunion[/b] with certain Foreigners. By doing so, they are bestowed with the Logic (or power) of that particular Foreigner to fight off other bad Foreigners.

[hider=Other Details]Terminologies:
1. [u]Paradox Level[/u] - this is how ALCA gauges the power of the assaulting Foreigner, with Level 1 being the weakest. The highest Paradox Level that has been recorded so far is at 9.8.
2. [u]Paradox Zone[/u] - whenever a Foreigner enters Septpia, they tend to affect the area in a certain radius around them. Anyone who gets caught within this radius and who isnt a Logicalist gets afflicted with Paradox Sickness.
3. [u]Gates[/u] - this is where Foreigners enter Septpia.
4. [u]Gate Card[/u] - the only way for Foreigners to open a Gate is to have a Gate Card. Its only 1 card per Foreigner. Once the Card is destroyed, the Gate will close and will never open again, either trapping the Foreigner to Septpia forever or wont be able to come back anymore. One way ticket.
5. [u]Trance Jack[/u] - forceful merging of a Foreigner to a non-Logicalist human. Its the only way Foreigners can cause major destruction to Septpia. Without a host, the Foreigner is just a wondering spirit.
6. [u]Logic Card[/u] - your identification as a Logicalist. Without this, Logicalists wont be able to Tranceunion with their Foreign partners. It also makes them immune to Paradox Sickness.[/hider]


The story will revolve around a certain group of Logicalists, their struggles upon taking up missions, and their general growth in the agency. I'll add more detail as soon as I get enough interests.

EDIT: This is going to be a multi-verse, so Foreigners can be from any universe which we will assume as Tetra-Heaven. Say, there can be a Hades, Anubis, Lucifer and Yama at the same time. Feel free to go wild.