Well, It looks like today Cipher Academy is cancelled, which is not surprising as the sale and ratings are low, not to mention the first official translator of the series finds it difficult that he calls it quits due to the difficult riddles in the series,

Also seeing that that cipher academy had a lot of chapters it could have had received an anime adaptation and merchandises, plus the ending of the manga reflects of the current conflicts in our world hoping those wars would end someday.

So in this thread we need to discuss why the series failed?

https://www.anime-japan.jp/activities/ajranking/vote/

Vote number 4, enter name and email, check the checkbox, then confirm

If you dont understand my previous post will explain.