Tate no Yuusha no Nariagari - Chapter 346 - Breaking the Limit

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

When Ares wakes up, he finds himself in a familiar world but in an unfamiliar body. It was a world he'd read about in a novel he discovered among the belongings of his late girlfriend.

But when he ended up in a novel that he had just finished reading before dying, his life changed for the better or the worse.

Why are all women crazy about me? Why are they pursuing me while ignoring the main character?

Join Ares on his journey through the novel to solve the mystery of his death and learn the truth about the world he ended up in.

His legendary class is The Husband Of Deathwill Sisters!

While other players went through common quests to get their classes, Alex started by getting a legendary class: Husband Of Deathwill Sisters! He got three beautiful wives from the start and the legendary castle!
What would his girlfriend and friends say about this once he reveals his class to them?
And what about Deathwill Sisters? What is their plight, and why would they suddenly get a husband?

When you get to the other world, you acquire new properties, there is no limit for your achievements and you become an overlord…Welcome to my world…

- Description from Novelupdates