Avatar - Conquering the Elements - Chapter 12. The Portal.

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?

“monarch of entropy” introduces a cosmic entity of immense power, whose eternal existence was once defined by passive observation. Everything changes when a surprising connection ignites a spark of curiosity and a yearning for interaction. As this King explores his evolving desires, his colossal abilities begin to influence realities on an unimaginable scale. This is the story of a powerful ruler's journey from detached observer to active participant, where every decision, no matter how small or whimsical, creates ripple effects across the multiverse, leading to a series of grand, and sometimes inconvenient, adventures.

It was the twenty-third year of Tianxi*. Rumours traversed the streets that the all-knowing Imperial Advisor suffered a great calamity and could not help but enter seclusion to focus on cultivation. However, the commoners secretly clapped their hands and rejoiced. In the winter of the same year, a young monk appeared in the Hui Zhou Fu’s Ningyang District.

The monk’s monastic title was Xuan Min, his memories all missing, yet was versed in the arts of Feng Shui Kan Yu**. On the very first day arriving in Ningyang, he did not hesitate to take care of a dangerous manor, picking up Xue Xian, who was hidden there, along the way.

Since then, Xue Xian – who had been all-powerful in the first half of his life – gained a new life pursuit: to get this baldy*** who had only a good outer appearance to take his last breath and “smile from his grave”.

Xue Xian: If you are unhappy, then I will be happy. If you die, I’ll laugh my ass off.

Xuan Min: …

- Description from Novelupdates

Beings that create and control monsters and demons, beings that build and reign over malicious labyrinths, the chosen individuals to possess an overwhelming Unique Skill… They are the Demon Lords.