The general enviroment of the game is... a TV show. It's an adventure game show in which 2-people teams of children the age of 12-18 compete to "recover hidden and lost artifacts from the ancient temples of the world". The four main characters are 12 years old at the beginning and 18 at the end, leading to a good opportunity for character development. The show is roughly based on Legends of the hidden temple and involves finding ancient artifact replicas in a maze-like temple.
Here's the best concept of the two I've seen thus far (Junpei and June from 999: 9 hours, 9 people, 9 doors):
Emile von Richter
Beginning and seasons 1-2
Season 3 and Etrosia
Season 4 and strange events
Revelations and finale
Levels and their parts
HP, PP, KO, Power licenses
Score, popularity stars and level cap
That would be it. Feel free to comment on it, but please tell if you're going to use any part of it.