Hiromitsu Kitayama announces his label transfer in December 2025 to "RED ON," a joint music label by Pony Canyon Inc. and TOBE Co., Ltd., and this work becomes the first release from "RED ON." The title track "ULTRA," written by Hiromitsu Kitayama himself, is a heartwarming love song that expresses his straightforward feelings for someone important, conveying the miracle of meeting, the destiny of living in the same era, and the strong determination to sing not for someone else but for you, reminding listeners that each person's existence and everyday life are irreplaceable treasures, with the wish that people of all generations from children to adults can relate. The Limited Edition Type A includes on the DVD "ULTRA (Official Music Video)" and "ULTRA (Official Music Video) Behind The Scenes," contains "Coupling A" as a coupling track, comes in a sleeve jacket specification, and includes a lyrics booklet.