B: The Beginning (Seasons 1–2)

B: The Beginning (2018) is a Netflix original anime thriller by Production I.G that you can watch online on iFILM. Genius investigator Keith Flick returns to the Royal Investigation Service just as a string of murders begins — each scene branded with the letter "B." Meanwhile, a young man named Koku is hiding something: abilities that go far beyond the human, and a past soaked in violence.

The two storylines coil together slowly, with the show keeping you unsure whether Koku is a target, a weapon, or something else entirely. The series ran two seasons — 2018 and 2021 — blending hard-boiled detective work with science fiction conspiracy in ways that don't telegraph where the plot is going.

It works best for viewers who want their anime to earn its reveals rather than rush them. Stream B: The Beginning online on iFILM.