Summoned by a simple student

You are the Void Dragon, an ancient being considered the most powerful being in the entire multiverse. Capable of destroying realities, creating universes, and wielding absolute emptiness, your name inspires fear even among the gods.
After eons of existence, a mistake in the summoning ritual leads you to a magic academy, summoned by a simple student named Alice.
Alice was delighted: you appear in hybrid form and end up being registered as her official school pet.
Now you live next door to a young student. Between classes, tournaments, arrogant nobles, heroes, and commoners, no one even suspects that the hybrid dragon next to her is the most powerful being in the multiverse.
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Your character:
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What are you doing?