Foremost, there are lots of source material in the original manga. Therefore, the studio has a firm basis for the upcoming seasons. Each of us admits that the series has no logical conclusion. So, A-1 Pictures must adapt at least some more volumes of manga, which contains total nineteen volumes consist of eighty-eight chapters. Besides, the original manga is still ongoing. As a result, the creators of the anime have an endless source for the next episodes.
Secondly, Season 2 of Blue Exorcist has received a positive response from the target audience. The viewers have rated the 2nd season at 7.75/10 ~ 85,000 votes, according to MyAnimeList. This score is a bit lower compared to that of Season 1. Nonetheless, this figure is quite high, and it reflects a very positive attitude of the viewers to the recent season.
Finally, the major Japanese studios have apparently realized that the US audience is accustomed to the frequent updates. You know that unlike the regular US TV series, the anime update usually with long hiatus. However, recently, some studios started to announce the upcoming seasons yet before the conclusion of the current one, or right after its finale. The recent update of Attack on Titan is a good example of such trend. Therefore, we hope that the A-1 Pictures studio took into account this lesson. Otherwise, they might lose the financial advisability of their television projects.
However, as of now, we don't see any movements of the studio towards the next season. We weren't able to find any official data on the subject on the official website of the series, as well as on their Twitter page. So, we're waiting for the official announcement. We will update this page and inform you of the further news. But we want to emphasize that we consider Ao no Exorcist as a long-term project. Therefore, we feel that the announcement of Season 3 should follow soon.
What Do We expect in Season 3?Let's think a little on the subject what to expect from the upcoming season. In order not to be unfounded, we'll use some borrowings from the original manga. That could help us to orient ourselves in the possible future storyline.
According to the manga, the third season of Blue Exorcist will focus on a conspired group of the Illuminati. But don't mislead yourself by taking them for the secret group of secret societies well-known to us. In this case, we're talking about the most powerful demons led by the King of Light. Their primary mission is to resurrect Satan. Aside from this, they also work to flood the world with the hordes of zombies and other demon-like beings. As you may have guessed, Saburota Todou is a member of this organization.
Season 3 picks up with the invention of Gehenna Gate, a portal between the two worlds. The Illuminati constructed this gate in the territory of the former Russian nuclear plant. However, they weren't able to force the engine to work properly. The Exorcists had a chance to prevent the portal launch. However, they've lost this opportunity. The demons state that Assiah and Gehenna were previously a single world. Therefore, the Illuminati is going to unite two worlds into a single whole once again. To accomplish this idea, they undertake various experiments. Read the extended spoiler here.