Recent reports indicate that the character Blade Knight (voiced by Todd Williams) appears in the fourth episode of this animated series. Duster season 1 episode 4 recap: The bill comes due - IMDb

The fourth episode of the 2019 anime adaptation is titled " Act Four – Rin at Odds " , featuring a recap of Makie and Kagehisa's childhood.

However, "The Blade" is also the title or subject of episodes in other series released around the same timeframe:

In this episode, a Revenant (a resurrected outlaw) begins killing people by emerging from mirrors and slicing their throats with a razor blade.

The fourth episode of this Marvel-based series is actually titled " Bloodlines " , though the show itself is often simply called "Blade".