Maou Gakuin No Futekigousha - Chapter 165.1

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

A lonely soul, which was placed under the care of the Lord Protector’s Manor, ended up having her lover stolen by the family’s eldest daughter and dying tragically the day before her wedding.

The story is about a a hitman, Who dies because of his own recklessness and transmigrates into a game he used to play after his retirement as a hitman.I'm not gonna spoil any further, but i might answer few of your questions.Is MC overpowered?Nope, he'll become strong over time and all battle he'll fight will be because of his effort and techniques.Is there magic and adventure?Yes! It have both magic like normal isekai with adventure and fighting with monsters and many other things. There are other important things like “Essence Stone” But let's talk about it in the chapters.There will be harem?Not really, He will be in contact with many beautiful female and males but one waifu but i haven't decided yet.All i can say is, give it a try, I'll try my best to make it worth your time.

She was framed by her sister and accidentally had a one-night stand with him. Later, he found various unreasonable excuses to force her to live with him. To seek revenge, she reluctantly agreed.“I...I thought you were gay!” She slowly retreated to the corner of the wall.“I thought you already knew the answer to that question that night,” he said, emphasizing the word “that night”.Later, to get a celebrity's headline news, she secretly sneaked into a grand engagement banquet. However...“Everyone, this is my fiancée.” He said to the guests, holding her waist. Upon hearing this, her stepmother and sister were both stunned.With his help and her own efforts, she thought she was going to live a happy life. However, her company suddenly had a new boss...“You! You eat my food, live in my house, sleep with me, and how dare you deduct my salary!”“What about that night you slept with me and only gave me $50?” He said.She thought to herself: How could a billionaire be so petty about just $50! She would definitely divorce!Six years later...“Mommy! This uncle said he'll be our daddy if we pay him just $50! Should we get him?”“Mommy! I agree with that!”