In Ultraman Taiga Ep. 2: Tregia, as a child, Hiroyuki had sympathy towards a small alien known as Chibisuke, but his last memory was of Chibisuke being taken away by aliens! Time goes by and Hiroyuki and Chibisuke meet again in a surprising way. There is an alien weapons auction that is being held, and some mysteriously dark shadow starts to move behind the scenes! Will Hiroyuki and Taiga be able to rescue Chibisuke?