The Debt Of Fate - Chapter 16: Keep Pretending,

It has been more than ten years since he was transported to another world. The protagonist Deris Fahrenheit, who has became a magician with special circumstances, was freely enjoying his life in this world. However, a girl appeared before him and asked him to make her his disciple. That girl seems to be a transported person――

It’s a story of him who becomes the girl’s teacher and trains her to achieve her revenge (?) in otherworld.

How can there be any invincibility?

How can there be any Xeon undefeated?

No one in this world can be eternally number one, anyone can be defeated.

including me.

I’ve been waiting for that one person to show up, beat me, tell me that my way is wrong.

It’s a pity that that person hasn’t come yet.

…

False martial arts: strengthen yourself, break the limits of the human body, and resist bullets with flesh and blood.

Real martial arts: use the magnetic field of life to dominate the magnetic field of the stars, use the small universe of the human body to attract the power of the big universe, travel the starry sky, and smash the planet.

- Description from novelbuddy

Setting in the fictional world of Gaia, where special individuals can awaken certain powers within their soul. They are called Arcana Masters.

Some awaken beasts, some awaken weapons, while some awaken the power of plants.

Some people train to become stronger so that they have the power to protect loved ones, some wish to use it for revenge, some wish to live longer, while some want to be free and use their power however they wish.

Yet, there exists a clan, where the descendants only exist to grant death to others so that life and death remain balanced.

Follow the journey of Azrael Garcia, the heir of the cursed clan of Death, as he forms friendships, facing betrayals, meeting love, and cutting down the enemies in the process.