The original voice actress of Eri is Seiran Kobayashi. She is a famous child star who was a cast of big-name movies, like Japanese’ movie adaptation of the “Murder on Orient Express”. Aside from being the voice behind Eri,  Seiran also made a name for voicing Shuriken Sentai Ninninger (2015), Okko’s Inn (2018), and Tae Kwon Do Damashii: Rebirth (2014).