Anime Crossover: I'm the Demon King, and I Make Anya Cry

I, Eli Vivian, Demon King of the Abyss, was ambushed by my nemesis Leon and transmigrated to a crossover world.

My once legendary power has dwindled to less than a hundredth of its former strength. Now I'm barely at the early stage of the beginner level.

A girl named Anya wakes me up. After I scare her to tears, we both get adopted by a man named Shige?

As luck would have it, Shige's other adopted son, Natsume Takashi, has a Book of Friends that seems to let me briefly recover my magic. Guess I'll settle in here for now.

But can someone explain why a proper Demon King has to go to school? And why is one of my classmates a dragon named Kanna? Is the human world really this complicated and full of variety?

I accidentally discover the secret of the shrine next door, only to be dragged into the Bone-Eater's Well by a girl named Kagome.

Life in this world grows more colorful by the day, and Eli's outlook begins to change...

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.