That Lie is a Scar - S2.E7

Ulith punishes Akira for her unsightly tactics, expressing her joy of breaking things and people and stating her wish is to have everyone continuously suffer in the LRIG cycle. Fearing for Hitoe's safety, Ruko agrees to battle against Ulith in order to rescue her. As Ruko and Tama battle against each other seriously, Tama urges Ruko to defeat her quickly using Iona's Level 5 form, with Tama barely withstanding Iona's attack. It is then that Iona recalls that Mayu is actually the mother who gave birth to both Iona, the Girl of Darkness, and Tama, the Girl of Light, at which point Mayu deals her own punishment to Iona.