Okami Wa Nemuranai - Chapter 9.6-7-8-

Liu Duo was a young girl whose grandmother sold her to four brothers with the intent to be a bride. Unwilling, she ran away the following night, only to fall unconscious while trying to get away. Unexpectedly, however, she was reborn with the spirit of a 25 year old woman, also named Liu Duo.

- Description from Novelupdates

Bai Ran had been married to Chen Chen for three years—three years in a secret marriage, only to have him hand her a divorce agreement. He asked her to sign it because he wanted to give his ultimate unattainable lover, Hu Wan, a beautiful ending. Chen Chen said, "Go and see Hu Wan tomorrow. If she asks you, tell her that you already have a boyfriend." Bai Ran said, "Okay." Chen Chen said, "You have to do everything it takes to convince her and make her happy." Bai Ran answered, "Okay." Staring at Bai Ranran's calm face, Chen Chen felt an inexplicable sense of frustration and uneasiness. Seeing the lack of hesitation on Bai Ran's face as she signed the divorce agreement, Chen Chen regretted it. To Bai Ran, ever since she signed the divorce agreement, Chen Chen's name had been erased from her memory. Even though she had loved him for more than ten years, once she gave up, she would never look back.

Seventeen-year-old Hajime Nagumo is your average, everyday otaku. However, his simple life of pulling all-nighters and sleeping in school is suddenly turned upside down when he, along with the rest of his class, is summoned to a fantasy world!

They’re treated like heroes and tasked with the duty of saving the human race from utter extinction.

But what should have been any otaku’s wet dream quickly turns into Hajime’s nightmare? While the rest of his class are blessed with godlike powers, Hajime’s job, Synergist, only has a single transmutation skill. Ridiculed and bullied by his classmates for being weak, he soon finds himself in despair.

Will he be able to survive in this dangerous world of monsters and demons with only a glorified blacksmith’s level of strength?

Drugged one night by her ex-boyfriend, a mysterious man took advantage of her in an ecstatic night filled with sex.To take her revenge, she married the man, and used him.