Hero Mask (stylized as HERO≠MASK) is a Japanese original net animation (ONA) series produced by Pierrot for Netflix.

[3] Set in a fictional version of London, James Blood is a hot-blooded officer working for the elite "Special Service of Crime" (SSC) division within the Capital Police Department.

Sarah Sinclair is a subordinate to Crown Prosecutor Monica Campbell, whose witness suddenly drops dead while working on a high-profile case involving the LIVE Corporation.

James ends up teaming with Sarah to uncover the perpetrators behind these events, dragging them into a conspiracy involving LIVE, escaped prisoners who supposedly died years ago, and masks that give their wearers superhuman abilities.

[8] The manga Hero Mask: A lost memory was first serialized in Japan on July 7, 2020, with new chapters made every week.