Mirage of Blaze
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Plot
Takaya Ougi, a high school student, wants nothing more than to protect his best friend Yuzuru Narita and live a normal life. That is, until Nobutsuna Naoe, an intense and charismatic man, informs Takaya that he is in fact the reincarnation of Lord Kagetora, the adopted son of a noble samurai lord, Kenshin Uesugi. Naoe, himself a "possessor," or a soul reborn through time, reawakens Takaya's abilities to exorcise evil spirits and fight the Feudal Underworld, a collection of restless warrior spirits bent on modern-day conquest. While most possessors remember their former lives before being reincarnated, Takaya is one of the few who doesn't, and is often hostile towards any effort for the complete recovery of his memory. As the plot unfolds, the complex history of the characters and their past suggests why this is so, and the true nature of the tempestuous and somewhat ambiguous relationship between the two leads provides the backdrop for a melodrama that spans several generations of Japanese history. As they ascend to the living world to renew their ancient war, Naoe, Takaya, and two other possessors gear up to prevent that from happening. The series is set in Matsumoto, a large city in Nagano.Wikipedia - https://en.wikipedia.org/wiki/Mirage_of_Blaze
Had an anime adaption in 2002 and an OVA in 2004.
Main series has 49 volumes. Including all the spinoffs, the franchise has over 70 volumes.