We were able to collaborate with Zoorasia, a zoo in Yokohama. Before starting the collaboration project, we visited Zoorasia and were given the opportunity to be introduced to the zoo and hear from the zookeepers of each animal. There, we felt how much each zookeeper loves the animals they are in charge of, and decided to create items that feature as many animals as possible. When we thought, "Just drawing animals as usual won't be interesting," we remembered how hard we had looked at the backside of a proboscis monkey, which looked like it was wearing white pants, and came up with the idea of focusing on backsides. We couldn't find any suitable reference images of backsides by searching on the web, so we asked the zookeepers to send us photos of each of their backsides. During the design check, they pointed out mistakes in the shape of the backsides and the length of the tails, and somehow we were able to complete the design and create the "Backside Pride Shirt."