B: The Beginning is a oNA (web) anime that premiered in winter 2018, produced by Production I.G.

About the production: the story comes from an original script, there are 12 episodes of about 26 minutes and its current status is "finished".

Its main genres are action, mystery, psychological, supernatural and thriller, with themes such as Police, Crime, Detective and Primarily Adult Cast.

On AniList, B: The Beginning has an average score of 69%, a good score, and appears on 103,126 users' lists.

The franchise continues in or follows from: B: The Beginning Succession.

In a world powered by advanced technology, crime and action unfold in the archipelagic nation of Cremona. Koku, the protagonist. Keith, the legendary investigator of the royal police force RIS. A mysterious criminal organization. A wide variety of characters race through the fortified city as it is beset by the serial killer, Killer B, and a chain of crimes. (Source: Netflix, edited)

Official synopsis from AniList.