The jap devs have always handled aigis. The thing was that nutaku tried to get dev rights because the jap devs gave us so long times between each event. They got dev rights and started training a group of people to handle it, which led to the dry summer last year. However, the jap devs took back their rights and then started churning out events at a better pace. So nutaku never really developed the game, except for the meager attempt in the summer last year.