Simple. Turn the Avengers into Digimon-esque collectibles and plug in a shonen flavored "Gotta Catch'em All" plot.
Like I said, Avengers meets Digimon.
While it's doubtful that this take on the Marvel Universe will ever make it stateside, only time will tell if this will bring more youngsters into the Marvel fandom. Longtime Marvel fans are skeptical at best, but only Japan knows how their audience ticks. Perhaps its crazy premise will make it a cult hit the same way the Japanese Spider-Man is now.