The cathedral that has the secrets of the abyss is my birthday gift

Little Noir is a sweet, quiet prankster, who had a normal, adventurous, unsuspecting life turns upside down when she receives her father's last gift on her birthday. Now determined to bring the truth to light, she chases after her father's murderer to the depths of the underworld in her new identity as Nocturne. join her in her story as she gathers allies(maybe not), befriends foes(it may not be the right word to use) and rises to power.