This art is referencing the Ultra Heroes Special Show that was held on September 22nd at Hokkaido Greenland, which featured an Ultraman Taiga live show where Ultra Dark-Killer featured as the main villain, with an assistant using the audience's imagination to create a clone Tregear. Said clone initially fought the Tri-Squad, but would betray Dark-Killer to fight with them. The clone would end up getting mortally wounded, and the shot of him resting in Taiga's arms would spread all over social media that day.