After Becoming a Military Advisor in the Demon King's Heart, Our Society Died.

The heroine of the social animal died suddenly and traveled to the demon realm to become a poisonous mushroom. When she was about to be crushed by the demon cultivator, she accidentally parasitized in the heart of the seriously injured demon king. To save her life, she disguised herself as "Inner Demon", using modern workplace language to PUA Demon Lord, the results are negative An unexpected coincidence helped him break through the bottleneck. Demon Lord discovers this "inner demon" Can predict the future (actually the heroine has read the original work), so Keep her as a counselor. And the heroine dealt with it cautiously At the same time, he secretly learned the techniques of various schools by relying on his parasitic ability, and in the Demon Lord's body Growing mushrooms while doing infrastructure construction...···