The Precure Slayer 

Kuroki Rio was raised in Paris With his twin sister, they were born as Fairies to worship the goddesses.

However, when Pikario wasn't able to transform into human like his twin sister.

He decided to try his best to work on his skills of baking, he studies in Paris.

But he couldn't match his twin sister's skills.

Everyone loved her and she never had time for him.

Pikario started to doubt about the existence of the goddesses and they haven't answered their prayers.

When he prayed one day to a goddess name Lumiere to help him learn how do use his skills correctly but nothing happened.

He realized that the goddesses were just made up.

So he cursed the goddesses and became a outcast.

Until He See's Shadowy Spirits Looking at Him.

They give him a weapon that could allow him to kill all goddesses and those who want to kill them.

That was the day, he became the Precure Slayer.