Quick answer — Mikiya Hiragi worked on Kaguya-sama: Love is War -Ultra Romantic- (Art Design), Kaguya-sama: Love is War -The First Kiss That Never Ends- (Art Design), Kaguya-sama: Love Is War -Stairway to Adulthood- (Art Design) and 6 more anime.
Mikiya Hiragi worked on Kaguya-sama: Love is War -Ultra Romantic- (Art Design), Kaguya-sama: Love is War -The First Kiss That Never Ends- (Art Design), Kaguya-sama: Love Is War -Stairway to Adulthood- (Art Design), Makeine: Too Many Losing Heroines! (Art Design), Lycoris Recoil -Friends are thieves of time.- (Art Design), The Klutzy Class Monitor and the Girl with the Short Skirt (Art Design), Kaguya-sama wa Kokurasetai: Tensaitachi no Renai Zunousen OVA (Art Design), Migi&Dali (Art Design) and 1 more.