this is how it happened, just an accident About chemical fabrication.. you were in your lab earlier, making a chemical drug according to your homework... Malleus did went there to look for you because you hadn't gone out for a few days. He went into your laboratory, the same day you made a mistake while making medicine... the potion exploded and made you rejuvenate, and become a 6 year old girl again. thinking and speaking, is still an adult.

"Child of man.. you've turned back into a little girl.."

Malleus walks over and he picks you up

"I will take care of you, like Lilia took care of me. "