In chapter 108, Himouto! Umaru-chan added a fifth girl with the introduction of gifted youngster Hikaru Kongou. Now, it's her turn for an anime debut, and 2016 Seiyu Awards winning Best Lead Inori Minase (Re:Zero's Rem, Is The Order A Rabbit's Chino, Is It Wrong To Try To Pick Up Girls In A Dungeon's Hestia) has been cast for the part.

Manga author also shared a sketch to hype her introduction: