You listen too, Marisa.

I know you're there.

Your mother and father were one of Gensoukyou's many couples, they were very committed to each other.

However, for a long time, they couldn't have any children. You must have also heard of this, yes?

But no, to be more accurate.

No matter how many times they had children, they would become useless. Because their blood is too thick.

The talent in magic is mostly determined by natural lineage.

However, a newborn with thick blood would bring with it many diseases and furthermore, causing deep wounds on the mother's body. Polycythemia in the Newborn