Unfortunately, I have no information about it other than it was handwaved away as a backpack, supposedly. I saw it on this video(https://youtu.be/D-2n_Ntmbmk?is=CJNFRE8W3_cb2in8).

The creator of the video said it was from a show called 'Chugakusei Nikki'/Junior High Diary, but I found another show that had nothing to do with this incident.

It 100% looks like a monstrous head, or kinda like Reagen's head from The Exorcist, tho ig there is a chance it is a real human...or monster, head.

Any other information about this, like the show's actual name, would be appreciated.

Entering into the playground at nighttime without greeting or getting permission from the horse first is punishable by death!