Fire Force S03E24 - Answer

Shinra's rage and despair spark the transformation of the earth into a second sun. With humanity's wish fulfilled, Haumea prays for her own death. Shinra faces her with a demonic expression, intent on killing her. Then, a huge flash of light strikes from space! The battle between the saintess (Haumea) and the hero (Shinra) reaches its climax!