Naruto: Kurotsuchi Mayuri - Chapter 177 - 130.2 : Regretful Hanzo!!

Once upon a time, there lived a person consumed by the desire for revenge.After finally achieving his goal of seeking revenge against all of his enemies, he was ultimately sentenced to death. Though he accepted his punishment, he suddenly found himself standing in an unfamiliar and surreal place, as if caught in a hallucination during his final moments. As his consciousness began to fade, a distinct voice accompanied him and whispered—”Welcome to Hell!”

Logan ends up in a world of familiars, where everyone can make a contract with a familiar to get super power and grow stronger.The first familiar Logan summons is a legendary angel, and it draws a lot of shock and envy.But fate messes with him, because right when Logan is about to make a contract with the angel, the angel looks down on his plain background.“Someone as noble as me—how can I be driven by a low-born bloodline?”After that, she goes over to the noble-born school beauty, leaving the whole crowd full of sneers.Right then, Logan awakens a system, and he can see all a familiar's hidden info and evolve their bloodlines, talents, and skills without limit.“Since it won't listen, I'll switch it out, the next one will be more obedient!”With everyone laughing at him, he just made a contract with a low-level succubus.“A low-level succubus? Once this kind of familiar gets off the bed, its fighting power isn't even as good as a hyena!”“A loser with a succubus—this kid will never have to worry about women anymore, haha!”...Many years later.When demon fire lights up the stars and blood-red wings cover the sky, people finally realize—standing behind Logan are all those ancient, scary beings from myths and legends.

The two faced number one female spy transmigrates to a different world and becomes an outrageous idiot girl. When she woke up, what she had to face was consecutive blows of the decline of her family clan, her crippled martial skills, and her disfiguration. To protect her family, she must obtain the treasured book, obtain outstanding achievements, summon a dark beast army. Wait and see how in this unfamiliar, dark magical continent, she dies and becomes a demon then steps up to the top, making all of the formidable people in the world bow down to her in respect.

- Description from Novelupdates

She killed his wife, destroyed his reputation, and ran off with his son. 8 years later, she returned home with her genius son, who already had a fiancée. “Give me the child, or you can’t afford the price.”“A girl who eats meat and vegetables doesn’t suffer, if you want a child, find yourself a woman to give you one.”