Hiruta co-produced Dragon Ball Z, Dragon Ball Z: Broly - The Legendary Super Saiyan, Dragon Ball Z: Broly - Second Coming, and Dragon Ball GT. He was a planner for the movies Dragon Ball Z: Bio-Broly, Dragon Ball Z: Fusion Reborn, Dragon Ball Z: Wrath of the Dragon, and Dragon Ball: The Path to Power. Seiichi Hiruta also did the planning for the Dr. Slump movies Dr. Slump and Arale-chan: N-cha! Love Comes From Penguin Village and Dr. Slump and Arale-chan: N-cha!! Trembling Heart of the Summer, as well as for Gegege no Kitarō: Yōkai Tokkyū! Maboroshi no Kisha, and Tamagotchi Honto no Hanashi.