The manga is about the Sengoku Jidai (Warring States Period) of Feudal Japan. The rulers of the land - Daimyo - and their servants - Samurai - fight to get the rule of all Japan. Especially, the most powerful ones are the Devil King Oda Nobunaga of Owari, the Tiger of Kai Takeda Shingen, the Dragon of Echigo Uesugi Kenshin, the Hojos of Odawara Castle

From MangaHelpers:
Sawamura Soushi is a soldier in a war-torn future. He meets a cute, innocent young girl named Nadeko, with whom he starts up a friendship. Nadeko is a flower girl, one of the girls who has a flower growing from her heart. One day, when Sawamura is trying to protect her from danger, she confesses her love to him and protects him with the plant growth that suddenly comes forth from her body.
Sawamura soon learns that there is a special squad of flower girls and their partners, and that their abilities are awakened when they fall in love. But does he really love a girl that is a decade his junior, and will he be willing to be a good partner for her? What's more, he learns that the awakening also starts the growing of the flowers in their bodies, so that the flower girl soldiers have only a short while longer to live. How can Sawamura and Nadeko make the best of such a terrible situation?

A manga based on the Sengoku Basara 3 action video game. The main characters, Date Masamune and Sanada Yukimura are two warlords who are both attempting to conquer all of the land. Almost greater than their desire to conquer, though, is their desire to fight each other in single combat.

From Bliss:

With the death of Nobunaga, Japan is thrown into a mist of battle once again as the many warlords of the nation try to unite it as one. But can any succeed when faced against Nobunaga's sucessor, Toyotomi and his lust for power thats sets the flame for war as he try to take over the world fulfilling his ambitions of absolute power?

In Hell, Tobe has been tortured for 300 years now, and his spirited desire to be free doesn't show any signs of fading. Tobe is given a final chance to make up for all the sins he committed while alive on Earth: he must use the legendary sword, Togari, to defeat and destroy 108 Sins in 108 days.

So Tobe is sent to modern-day Japan, and even though things aren't exactly like the Japan he remembers, he must defeat the 108 Sins in time to be free again.

From Tokyopop:
When Julin Misumi has a recurring dream about an age ruled by martial arts, strange things start happening. She is attacked by a mysterious bird woman, saved by a masked man and given a bell by a little bird. Now she must team up with an enigmatic man named Hitoshi Ninno, who has given her the title of Toku-Lin - and the mission of saving the world.

From Tokyopop:

Separated at birth, three Shaolin Princesses trained in the arts of supernatural and physical combat must work together to defeat evil.

Based on the events of the tenth Shakugan no Shana novel.

From Hidoi~! Translators:
Hyung Gee is an ordinary high student, but is unaware of the power he holds called “Shade”. His encounter with Soy completely changes his life around, as the hidden powers within him awakens, causing Soy and her Shade to lose their lives. Unaware of the mystery behind “Shade” and the role of a “Shade Magician”, Hyung Gee decides to join ‘School’, which is an organization that does research on “Shade Magicians”. Although Hyung Gee joined to find out more about his powers and his parents (who are currently missing), little does he know that this was all a plot from the School to get him to join.

In a move designed to try, and reform the infamous Saiyan Assassin into a good person, Enma-ou bonds Raditz's spirit to that of his pure hearted his brother, Son Goku. Now, with just one year until Nappa and Vejita's imminent arrival on Earth, the two have been tasked with traveling along The Great Snake Way, and seeking the tutelage of Kaio-sama, in order to grow stronger to face the looming Saiyan threat. Will Raditz reform? Will poor Goku make it out with his heart unblemished? And most importantly: Will these two ever learn to get along??

Inariya returns to war fiction, with this story of two Italian soldiers on the Russian front during the last days of WWII.

The tyrannical rule, foolish king and greedy nobles cause the powerless citizens nothing but misfortune. In this ruined land, Sion Astal, the son of King Roland and an ordinary woman is faced with the difficult destiny of rescuing the country...and his friend!

The Chronicles of Covak tells the story of the early days of the continent of Adina through the eyes of Dilan, prince of the Timeidans.

At the end of the 20th Century, the world is facing destruction from massive earthquakes, bad weather and other abnormal phenomena. In Tokyo, Setsuna Kai, a young boy who lost his mother when he was very small, practices Kendo every day because his goal in life is to become strong. As always, his rival Mirai Kaname defeats him and Setsuna feels sad. On his way home, a messenger from the Devil's World appears before him. This messenger proclaims that the various abnormal changes in the world are the work of the Devil. The world will come to an end unless the Devil is conquered. The only ones who can save the world are the "Devil Children." Thus begins Setsuna's adventure in the Devil's World. From RebelliousArt: A boy develops powers to save the world from monsters. He joins up with others who have similar powers to him.

Before the outbreak of the colony war, forces were at work shaping the future and preparing its players for the final game. As children, Heero, Relena, Duo, Trowa, Quatre and Wufei have endured more pain and difficulties than most people experience in a lifetime and would have broken the will of any normal person. Learn their stories and motivations for becoming prominent characters in shaping the future of the world. Each chapter is named after a character and features that character's past/origins.

Note: The events of Episode Zero were supposed to appear in the TV series after episode 27 but was eventually omitted due to complications in the production schedule. Episode Zero was created per Ikeda Masashi's (director) request.

After the war that took place in A.C. 195, each of the protagonists have gone on with their lives, and the gundams put into retirement. As the peace alliance with the colonies push through, a new menace threatens to shatter the peace, and the five gundam pilots are forced into action once again. Blind Target is originally a radio drama that got translated into manga. It is one of the possible events that took place between the series itself and the OVA, Endless Waltz. Other manga titles that also delve into the possible events between the series and the OVA are Battlefield of Pacifists and Ground Zero. All three remain unrelated to one another.

From Tokyopop: After a generation of warfare, the Gundam boys finally secured a peace between Earth and the colonies by helping to defeat the Oz and White Fang armies. Now, out of the rubble, the surviving soldiers are re-emerging and clustering together into new factions. Hero Yuy has become a vigilante pacifist, tracking down weapons stashes and destroying them, while Relena, former Queen of the Earth Sphere, tries to maintain the peace politically. But an unmanned weapons factory has been discovered somewhere near Mars, and now the boys are going to have to dust off their mechs for one more battle to save the tenuous peace.