If you're looking for manga similar to The Epic of Zektbach, you might like these titles.
Jubei Yagyu is the head of the Yagyu Clan following the events of Demonic Resurrection and has mostly retired from the world. A group of warriors decide to ask him if he wants to take over a post at their dojo, but Jubei is more interested in watching the Noh of his friend and subordinate Chikuami.
Set just before World War II: Having honed his swordsmanship to a fine art, dashing young Kumomaru leaves his native Japan to see the world and test himself against the evil forces brewing an apocalyptic world war. His companions include a beautiful French woman and the as yet unknown writer Ernest Hemingway.
Yorozu Genkurou, wandering warrior, possesses an huge sword which makes him redoubtable to his enemies. While he crosses a dark forest, he suddenly sees the fall of what looks very much like a spaceship. Since, he is constantly being attacked by strange ninjas and ambitous fighters. Indeed, he will soon realize that his assailants are nothing else than aliens landed on Earth to find 3 artifacts made of Orichalcum, an alien substance with powerful mystical virtues. And one of the artifacts is the sword he wears. The hunt begins.
Lily Liemola is a powerful swordsman with rather old-fashioned ideals about honourable battle. When he hears of a "legendary fighter" named Albert Wilhelmus who many skilled combatants have failed to even approach - let alone defeat - Liemola wastes no time in challenging this man to a duel.
There is a competition for those who possess the spirit weapons. Only someone with one of these weapons can defeat another. Enter our protagonist, a clumsy flower girl who one day embarrasses a weapon master... What is our flower girl going to do? What is the purpose of this competition?
When humans first discovered fire, it filled them with fear. As time passed, they mastered fire, and used it to melt iron and forge weapons. This taught them to build their power, make war and rule one another. Follow the journey of Akoya, a young woman protected by a mountain spirit, as she fights for survival in Japan long before the samurai came to rule.