Fantasy Manga which you may have not heard about.

1. Saikyou No Maou Ni Kitaerareta Yuusha Isekai Kikanshatati No Gakuen De Musou Suru.

Without possessing the unique skill blessed by the goddess, a boy named Kujou Kyouya failed to save the world. He was ridiculed as a “failed hero” at the interdimensional-level academy where returned heroes who had saved many worlds gathered. However, he became the strongest and most unique hero, having trained for 30,000 years in another world with the most evil demon king, Felice, who has destroyed 3,000 worlds! Now Kyouya's unique skill is so powerful that he cannot even be defeated by the strongest heroes! The legend of a boy trained by the most evil demon king, begins!

2. The Macrocosm Era.

Alternate title: Age of Cosmic Exploration.

Space voyage, time travel, and mechanical technology to explore the unknown starry sea! After doomsday, mankind adventures into the universe. In the unexplored world, the power of space adaptors is awakened, beginning the macrocosm era.

3. Kamigami No Kago De Seisan Kakumei.

During the reincarnation of the Japanese company slave, Tadashi, he was impressed by God by choosing the agricultural blessing that no one had ever chosen, and received unprecedented generous blessing. And he has a dream slow life in a different world-it should have landed all-you-can-eat, a huge peninsula called Miasma Limbo! Tadashi struggled, but with his serious personality and blessing from God, he will increase the scale of agriculture with Gungun. Former queens of persecuted elves, heroes of beastmen, and master craftsmen of dwarves gathered in search of supplies made by Tadashi. Agriculture, founding of the country, slow life! A heartwarming different world agricultural fantasy, comicalize!

4. The Girl Who Was Forced By Her Stepsister To Marry The Cursed Duke.

Miltia was treated as a servant and oppressed by her stepmother and her stepsister because there was no blood relation between her and them. She was having trouble getting enough food to survive everyday. Somehow she was able to get by through cooking whatever thing she could find herself.
In the midst of all this, her stepsister, who was doted on by both her stepfather and her stepmother, along with her fiancé, who was only interested in a woman's youth and physical appearance, cruelly broke off her engagement in public and forced her to marry the notorious 『Cursed Duke』, the Duke of Lönnrot.
Because of the curse, the duke had a repulsive, monstrous appearance. He was ostracized by a lot of people and grew distrustful of people… At first, he was hard on Miltia but to Miltia, the duke's monstrous appearance actually resembled an octopus, an ingredient she had grown used to seeing so she didn't find the duke's appearance to be repulsive. Furthermore, she was actually happier living in the ducal house compared to in her previous county house since her daily necessities were provided by the ducal household.
As the result of her, faithfully serving the 『Cursed Duke』, along with Miltia's unexpected behaviour, she gradually melted Duke Lönnrot's cold and hard heart. She was also able to grab a hold of the duke's stomach through her cooking.
The duke, whose curse was lifted by the cooking of the woman he loved, was actually a very beautiful young man.
As soon as her stepsister found out about it, she completely changed her demeanor and insisted.
“I want to swap our fiancé!!”
But of course, the duke wouldn't tolerate such selfishness. Eventually, the people who had abused Miltia, reaped what they sowed and fell into their demise.
This is the story of Miltia, a young girl who was abused, scorned and survived through eating whatever things she could get but she eventually received her happiness and doted on by the cursed duke.

5. Koware Skill De Hajimeru Gendai Dungeon Kouryaku.

It's been several years since "dungeons" appeared all over the world. Ryosuke Mizuki, a company slave, is present at the scene where his workplace was swallowed by the dungeon and gets the cheat skill “Skill Book”. Taking this opportunity, will he change his dull company slave life and challenge an unknown adventure...!?

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