Synopsis
Now there's a mysterious Mask before James Blood, and the man behind it is one that shouldn't exist. What is the mystery surrounding this mask...? So begins an action-packed crime story set in a beautiful city!
| Hero Mask | |
|---|---|
 | |
| Image of Hero Mask | |
| ONA Name (English) | Hero Mask |
| Name in original language | ヒーローマスク |
| Type | ONA |
| Studio | Pierrot |
| Episodes | 15 |
| Aired | December 1, 2018 |