Back to Hogwarts: The Transfer Student Has Something to Say

[Hogwarts Legacy + Transmigration + Dark Lord] Faced with Sebastian using the Killing Curse, the transfer student finally makes up their mind to send him to Azkaban with their close friend Ominis. One day, the transfer student, who has been missing for a long time, seeks out Ominis and asks to use his power to travel back in time to their fifth year with time magic, hoping to change Sebastian's life. But the transfer student seems to have other plans, too. What will happen when a true wolf in sheep's clothing meets a transfer student who is still growing? How will the transfer student react to meeting a disguised version of themself? What does that Hogwarts letter of acceptance for fifth year really mean? What's going on here?