Demon Sword Maiden - Volume 1, Chapter 5 – Lost Memories

An average man is reincarnated in the world of DxD! How do you survive in a world of battle-hungry monsters? With a cheat skill, of course! Devour the competition, becoming stronger with every fight! From the depths of the Familiar Forest, the Beast King will rise. (Harem, Gamer!SI)

To correct the mistakes of his past, a young man is forced to narrow the space between science and witchcraft, as he ventures on a quest to save his world from complete destruction.

She was a medical genius from the Noah Medical Academy as well as a drug producing specialist. After sleeping for three days, she had returned to the ancient era and become the loyal marquis palace’s ignorant and silly young miss.

I closed my eyes and let out a long, shuddering breath. The needle slipped through my numb fingers and clattered onto the rough pavement. Nothingness swirled around me, bringing the first peace I'd felt in my short, miserable life. No one would miss me, and if any did...? Well, there was always someone else to beat or rape. They'd move on quickly.But then...gods? Since when did nothingness have so many gods?Chosen by the goddess of Fate, I'm thrust into a world of magic and wonder alongside nine other heroes. A world where the gods reign supreme, and evil is vanquished before it can spread its blight.Can such a place truly exist? Could life really be worth living?I've heard that the brightest lights cast the longest shadows, but my life has been nothing but darkness. Perhaps this new world will be the chance I need to find the light, to see the other side.