The Misfit of Demon King Academy synopsis of the episode 4 "15th Birthday", and the preceding cut arrived.
Previously on Episode 3:
Ivis, one of the seven Elder Demon Emperors Anos created from his blood, now run the academy as the seven deans. Anos realizes Ivis does not remember him, so he sends Ivis back in time to retrieve his memories, only to realize someone actually altered the past itself so everyone believes the demon King was someone called Avos Dilhevia. Ivis decides to remain neutral since Anos also possesses the necessary power to change the past, and he is not sure if he can trust Anos yet. For the next academy challenge, students are told to collect magic items from a castle which is actually Anos' home from 2000 years ago. He decides to collect a scepter at the lowest level. After collecting the scepter, he allows Misha to take one of his personal items, the Phoenix Robe, for Sasha's birthday to enhance her flame magic. However, Sasha stabs Misha and claims she was never their ally, but was waiting for a chance to betray them. Anos claims she is lying since her demonic eyes should have activated under intense emotion, but they did not. Sasha flees with the robe and scepter, claiming she hates Misha. Misha admits to Anos that she will disappear the moment she and Sasha turn 15 and that the person he thinks of as Misha does not actually exist.