All around incredible story. I loved it.

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Eugeo Belial- interesting to see satan Leviathan being the daughter of her coworker, interesting dynamic

+1 demon w/ curse, it goes well with the theme of darker opinions Tatsumi has, and his attitude towards death and the like , but with a curse he could do something with the Murasame poison in his body, maybe like a poison curse or absorption curse so he can accumulate power from being attacked, or harmed so he never really faces roadblocks down the road.

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Failing in some minor things would be fine for me, like trial and error for techniques and the like, but I’d rather him have success when it matters instead of doing the whole long training arc type thing

For the demon lord sees you can have her parasite part of the shinju tree in the final battle, and consume the souls then when no one knows, and she can get the heros egg from eating naruto and/or sasuke after they fight each other and lose their arms once they beat kaguya

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