The first and major indicator is that there are nine volumes in the original light novel series, and it's ongoing, besides. Moreover, there are five additional volumes of the manga series as well. As a result, there must be something more than just a 12-episode television adaptation. After all, the light novel updates regularly. The most recent volume was issued on April 8, 2017, two days prior the premiere of the anime series. This fact points out that there will be other volumes in the original series in the foreseeable future. Therefore, the show's creators won't feel a lack of the source material. So, we rule out this factor as one able to affect the decision on renewal.
Another key factor is a reception by the target audience. Though this indicator can't be regarded as primary, it, nonetheless, reflects the attitude of the viewers to the series. The score of Grimoire of Zero looks average, but it's still pretty high. According to MyAnimeList, the anime has a rating of 7.23 ~ 47,700 votes, which is more than enough to renew the series for a next season. Unfortunately, in Japan, the show's creators pay little attention to this indicator unlike the US and European producers. Nevertheless, this factor plays in favor of the series.
Lastly, some fans rightfully noted that the BD/DVD sales of the Zero Kara Hajimeru Mahou no Sho series were weak. Indeed, they sold about 350-360 items per week. Of course, we can't consider such results impressive, but these figures, in fact, not so much low. On the other hand, these sales may not have covered the expenses. In that case, the show's creators won't create another season of the show, of course.
Summing up, we conclude that, in general, the odds for renewal are not so bad. This situation looks quite average in the world of anime. After all, we've seen numerous anime series that have not been updated for years but have suddenly gotten another installment. The final decision mostly depends on the studio itself. And sometimes, their choice could be entirely unexpected. So, we don't think that the fans of Zero Kara Hajimeru Mahou no Sho must give up. On the contrary, just a few months passed since the conclusion of the first season. Everything might change soon. We just need to wait for the official announcement.
Grimoire of Zero premiered in April 2017 on AT-X. Later, Tokyo MX, SUN, KBS, and other Japanese broadcasters started airing the series. White Fox Co., Ltd. acted as a developer of the television adaptation. Sentai Filmworks served a licensor of the anime in North America. The first season of Zero Kara Hajimeru Mahou no Sho consisted of twelve episodes came to an end on June 26, 2017. Since then, there has been no official news about renewal. To be sure of this, we suggest you visit the official website of the anime series.
What Is The Grimoire of Zero Anime About?In the world, where the magic initially exists for assisting people, the witches waged war against them. There is a belief that one powerful witch caused a plague in the state in former times. As a result, many people died. Therefore, people hate witches. It's believed that the so-called "beastfallen" are the best witch hunters. Their body shares two natures, hence they half-man, half-beast. That's why these creatures are the best mercenary since they surpass any human in physical abilities. However, the witches also hunt beastfallen, because their heads have a high value on the witch market.
But one day, one beastfallen encounters a witch named Zero, who promises him to fulfill his dream of becoming human. To accomplish this idea, they both must find a powerful Grimoire, which can be dangerous in the wrong hands. The storyline thereby follows their adventures on a mission to find this magical spell book.