If you're looking for manga similar to Seventh (Light Novel), you might like these titles.
In order to stay by the side of his liege, Arsmeria, the devoted knight Vance chose to reincarnate with her a thousand years into the future. In his new life he's known as Lloyd, the foster son of Countess Myuria and the wielder of colorless magic. But Lloyd has kept his memories of his past life and of his quest, and when he finds that Arsmeria's reincarnation has been split into six parts, he realizes he's got his work cut out for him!
Dyngir Maxwell, successor to the margrave of the eastern provinces of the Lamperouge kingdom, was infamous for his womanizing habits, but proved himself multiple times in conflicts with neighboring countries and a major player in domestic politics well trusted by other nobles. Everything was sailing smoothly for Dyngir, when a life-changing event occurred: “Dyngir Maxwell! I hereby declare your engagement to Selena void!!” Dyngir believed the relationship with his fiancee to be idyllic, but she was actually having an affair with crown prince Sullivan. The moronic prince even dared slander the good name of the Maxwell house… If this is your game, then I’m going to play too. You picked a fight with the wrong person!...
Strapped for cash, Souya signs up for a shady gig straight out of a videogamewarp to a fantasy world with a team of experts and ascend a dungeon tower to make off with its spoils. However, an accident in the transfer process leaves him stranded and alone. Desperate for support, he recruits a host of adventurers to form a dungeon-diving party of his own: from elf sisters banished from their forest to Mithlanica, a goddess of deception and secrecy partial to lazing about as a cat. Caught between corrupt nobles and merchants outside the dungeon and deadly monsters within, can our motley band rise to the challenge? Or will Souya’s adventure end before it can even begin?
Alek's dream was to marry his childhood friend, Chloe, who was a maid. However, having been born as the next heir of one the three highest ranking nobles in the empire, there was a difference in status between him and Chloe who belonged to a different branch of the family. In order to marry her, he made up his mind to obtain enough power to oppose his father. Nevertheless, he was still given the duty to find a great number of brides. "It can't be helped. To marry my maid, I'll have to create a harem!"
Hidden dungeons—legendary places that no one knows how to enter—are full of extremely rare items, incredibly dangerous beasts, and strange beings that can grant power beyond measure. Noir, the third son of a penniless baronet, just lost his job. He was contemplating becoming an adventurer when fortune struck only a mile from home, and he opened the entrance to just such a dungeon!
Syltina was originally a Duke’s daughter. Sentenced to exile two years ago, she crossed over to the neighboring country and entered its Guild. The current Syltina, who became strong to the extent that even foreign countries knew her name, was summoned by the country which exiled her. In order to purify the land defiled by monsters, Syltina gets stuck in a journey with a partner who constantly has zero motivation, the girl from the different world who drove her into banishment, the First Prince who was her former fiance, her former brother who is a Knight and a pointlessly shy magician.
The people of this world are given occupations and weapons called Divine Treasures by God. It was said that the treasure was very strong and couldn’t be compared to the Human-made weapons. That’s why, occupations which were called “Blacksmith”, who can make and modify weapons are called the weakest. The main protagonist Relius who has acquired such a weakest job. He gave up on becoming an adventurer and worked in an inn, but he realized that he could make “Anything”. He, who was making what he liked, became aware of the relationship with famous nobles and beautiful girls.
Tomoya Sadoshima died after a serious accident due to the mismanagment of a Goddess. Then, after regaining consciousness in a pure white world, a woman of divine beauty emerged, she introduces herself as "The Goddess of Creation." The goddess of creation prepared a remedy for his suffering, she offers him to reincarnate into a different world than his own. But it was a world in a war situation with the demon king. And so begins the story of Tomoya and his adventure to defeat the demon king and get the harem he so desires!