Summary
Demons were beings born from the gathering and materialization of negative emotions in people. Touya, born as the heir of the Koutoku family—a lineage of onmyoji who fought such demons—was a reincarnator.
In his previous life, Touya had been summoned from modern Japan to another world, where he'd fought the Demon King and ended in a mutual kill. Thus, he had quite an extraordinary background, having reincarnated after that.
He returned once more to Japan.
However, it was a world that seemed like a modern fantasy, one where demons existed and onmyoji were present.
"Huh? The jujutsu in this world is almost the same as the magic from the other world, isn’t it?"
Upon reincarnating into such a world, Touya quickly realized something: his knowledge from his previous life could be maximized to the fullest.
If he could become strong, there was no harm in being strong. After all, in such a dangerous world, he never knew what might happen. Making full use of his past-life knowledge, Touya steadily honed his abilities with training methods that were only possible because he was a baby.
One day, Touya grew to a level where he could be called the strongest in the world, and he began to be pressed by beautiful young women from prestigious onmyoji families, asking him to become their husband.
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