Reborn with Steve Stand - Chapter 783: Sakura and Fujimura Taiga

A woman from ancient times falls in love with her soulmate.

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

Kenji had become the Emperor’s right hand man which he always wanted to be. He thought that this position would help him to become one of the most popular and powerful figure in history, He did not know that the newly crowned Emperor considered him as a threat. Secrets were being prepared to deal with this ‘dangerous subject’ who had become too influential to be ignored.“Oh, Dearest brother, I have to congratulate you on your well-deserved hire! How great must it feel to receive a court audience and the special joy of having a sword under your head before the imperial family!” The emperor said warmly.'Oh dearest sister... Your congrats are out of place... you just made the situation worse...'

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.