From a young age, Minami Harusumi has had recurring dreams of Veronica, a princess whose kingdom is on the verge of destruction. He believes them to be recollections of his past life, and that he is her reincarnation. Because of this, he is ridiculed by his classmates. One day, when the mockery escalates into bullying, he rediscovers magic - something Veronica had studied and used. Reassured his past life is not merely a fantasy, Minami tries to learn more about his past memories and the reason behind them...

From MangaHelpers:

History classes have never interested Saburo. He never saw the point of learning something that happened in the past, let alone a few hundred years ago. But when he falls off a wall, he travels through a wormhole and ends up in 16th century ancient Japan. He meets a very young Oda Nobunaga, one of the most influential figures in Japanese history, who turns out to be identical in appearance as Saburo. The real Nobunaga, sick of the castle life and wanting to travel, orders Saburo to take his place. Without knowing how to get back to his time, Saburo tries to make sure history isn’t rewritten for the infamous Oda Nobunaga. [vyc]

Won the 57th Shogakukan Manga Award for shounen.

Makoto Kubota wandered through life, not taking things too seriously or looking too deep within himself. His job as the head of the Izumo Group's youth gang kept him pleasantly occupied with yakuza wars, mahjong and assassinations... Until the day he stumbled upon a strange drug called Wild Adapter that produces bizarre side-effects--including death. Forever changed, Kubota becomes entangled with a drifter named Minoru Tokito, and the two form an unlikely companionship that draws them deeper into the mystery of Wild Adapter...

From Shoujo Manga Maniac:
Chigusa Tsukikage holds the rights to the play "The Crimson Goddess," a lost masterpiece that many would love to see brought back to the stage.
Tsukikage, however, won't allow the cherished work to be diminished by an actress who isn't worthy of playing the title role. Fortunately, she has found two young actresses that just might be worthy: Maya Kitajima and Ayumi Himekawa. Though both actresses are exceptionally talented, only one can win the coveted role.

Nobuko Tanaka is a college student working part-time at a supermarket. Due to her shy and plain nature, her name is constantly mistaken for “Mobuko,” which has the kanji for “supporting role”. So when she develops feelings for her kind co-worker, Irie, will she be able to gather her courage and grow closer to him? Will this “supporting role” actress finally get a chance in the romantic spotlight?

The world is filled with cruel scum, ranging from petty thieves to sociopath maniacs. When a vile low-life inflicts pain and suffering on innocent victims, sometimes their anger becomes overwhelming. Whether their damage stems from romance, finance, reputation or even a death, these victims feel trapped in their own skins and lives.

Those victims who can't stand it anymore call for the mysterious woman, owner of Uramiya, the "Revenge Shop".

The Uramiya specializes in executing revenge schemes. The vengeance their customers request on their bitterly resented enemies could range from financially destroying them, to smearing their social reputation, to even taking their lives. As long as you pay a fair price, the Uramiya will guarantee you get the revenge you deserve.

The setting of Fate/Apocrypha is a parallel world to Fate/stay night where the Greater Grail was removed from Fuyuki after the Third Holy Grail War and disappeared for many years. Around the 2000s, around the same time as the Fifth Holy Grail War would have happened, the group that plundered the Grail, Yggdmillennia, openly declares their secession from the Mage's Association and that they are in possession of the Grail. The Association dispatches fifty magi to retrieve it, but all but one are instantly slaughtered by Lancer of Black. The one remaining manages to activate the reserve system of the Greater Grail, allowing for the summoning of fourteen Servants in total.

Story of a buxom and no-nonsense crime-fighting mentalist.

After regaining consciousness, your average high-schooler Asagaya Shin has become an AI for a space battleship. As if that wasn’t enough, the ship has been surrounded by enemies, and he himself has a damaged engine, putting him in a dire situation.

The warship commander had already died in combat, and taking the place of the temporary commander is a young girl of the imperial family, who had joined the ship out of courtesy. Shin had tried convincing himself that this was a dream, but being persuaded by the girl, he stands as a battleship.

After somehow crushing the enemy at point-blank range, the fleet’s fight is over, and the battle for the fate of the empire has ended in a crushing defeat. Shin gathers up the survivors and plans to escape the battleground, but there’s a large enemy fleet on the route to the empire. He makes a jump deep into the enemy territory on a slim chance, but —

Set 10,000 years in the future, a young boy has been turned into an incredibly powerful cheat AI and leads a small fleet to become peerless. There’s romantic comedy, imperial intrigue, ancient weapons, philosophy, and more!

Koyomi Araragi, a third year high school student who is almost human again after briefly becoming a vampire. One day, a classmate named Hitagi Senjougahara, who infamously never talks to anyone, falls down the stairs into Koyomi's arms. He discovers that Hitagi weighs next to nothing, in defiance of physics. Despite being threatened by her, Koyomi offers his help, and introduces her to Meme Oshino, a middle-aged homeless man who helped him stop being a vampire.

“What a dogshit life… honestly.”

Though he had become a disciple of the Heavenly Demon amidst the strife-filled Demonic Sect,
Yeon So-Woon gets betrayed by his disciple-brother and comes to meet his end.

However…
When he woke up, he’s back to the time when he was a kid, before he got dragged into the Demonic Sect?!

Loath to repeat his hellish life in the Demonic Sect, Yeon So-Woon begins to plan for his new life.

"I’ll enact revenge on the Demonic Sect,
Become an elder of the Murim Union,
And thus, live a prosperous and respected life."

A man was reincarnated as Van, a boy of noble birth, who grew up to become a child prodigy through hard work. But when it was discovered that he possessed "production magic," he was immediately relegated to a remote village. However, his magic, which was called useless, turned out to be truly extraordinary, capable of producing anything as long as he had the right ingredients! With the knowledge from his previous life and the overpowered magic, the small, poor village will grow to become into a great city.

Its an amazing story about one martial arts journey through marriage, fatherhood, and battles.

Death row prisoner. Criminals who committed violent crimes and were sentenced to death by law. Akari, a woman who had no meaning in the prison island “Deep Palace” near death, accommodating them, acted with a certain purpose. Just when she thought she was able to complete my purpose safely, the death row prisoners have started to kill each other? A battle royal “Killing” was held where men and women were separated and the remaining team could escape!! Can Akari survive the “Killing” safely and escape from prison? Blood, Eros, and dangerous guys fly around, all the characters, a Battle Royale of all scum prisoners!!!!!

Ever since he saw the legendary player known as the "Little Giant" compete at the national volleyball finals, Shoyo Hinata has aimed to be the best volleyball player ever! He decides to join the team at the high school the Little Giant went to – and then surpass him. Who says you need to be tall to play volleyball when you can jump higher than anyone else?

Note: Won the 61st Shogakukan Manga Award for best shounen manga in 2017.

The virtual reality game “History of the Archana Continent” became part of reality, and “players” who were synchronized with humans appeared to protect the world. Lee Hoyeol, who was an ordinary salaryman, took over the body of the character he created in middle school, “Grandfell Claudi Arpeus Romeo.” Under normal circumstances, it would have been an absolute failure of a career, but Grandfell, whose occupation is a “demon hunter,” becomes extremely proud in front of demons! The only demon hunter in this world, Grandfell (= Lee Hoyeol) starts to make a move!

Due to the situation like the second IMF, the security company Jang Taesan worked for goes bankrupt, and he becomes an unemployed man wandering around Noryangjin-dong. He loses his life saving an elementary school student who was almost hit by a car. But thanks to his good deed, he goes 14 years back in time and is welcomed to a new life.

However the joy of being revived is short-lived. The thought of having to take the college entrance exam again makes me dizzy... But I remember all of the CSAT problems that I encountered while studying and the stock market graph I saw while working as a stockbroker...?! The last life was ruined, but the this next life will become a success!

A man tried hard living up to his motto "I don't want to work" - Ninomiya Kinja, was summoned to a different world and forced to work in harsh environments with low wages, and long hours

Si-hyuk finds himself thrust into sudden responsibility when his parents tragically pass away in a car accident, leaving behind his much younger brother, Si-ha, who is two decades his junior. At the funeral, amidst the hushed murmurs of relatives, discussions arise about the uncertain future of the two brothers.

"What's the plan for those two? Who's going to step up?"
"Goodness, now that he's in college, how will he manage to care for his little brother?"
"Wasn't there some insurance payout?"

Amidst the chaos and uncertain discussions, Si-ha utters his first clear words. "Brother. Brother." It's a heartfelt cry, not for Mom or Dad, but for his older brother. Si-hyuk moves slowly toward Si-ha, embracing him tightly. "I'll take care of you," he whispers.

It is a world where order is maintained by three great factions, the Church which bears the greatest authority, the Order of Clausius possessing influence on par with the Church, immense assets and military might, and lastly the Guild of Commerce, an association of merchants and artisans alike.
The alchemist Kusler who was captured and imprisoned because he committed the offense of trying to burn a saint's bones, sold his skills and talents to the Order of Clausius. Together with an old friend, Welland, they were then dispatched towards the town of Grubetti which was close to the front lines.
And then at a workshop in Grubetti which boasted advanced equipment due to being near the front lines, Kusler met the devout nun Urle Fenesis who had introduced herself as a "watchdog."