This is a mysterious hoodie with the HALHAM tag, but the chest embroidery says "atmark." There was no official collaboration, and the quality of the embroidery is so high that it's unlikely to have been factory-made, making this hoodie quite enigmatic. I'm unsure whether it will be valuable as a rare item or cheaper as a defective product, so I've priced it accordingly. There are some yellowed areas in the photos, but this is not a stain; it's a defect in my smartphone camera. I apologize for any confusion.