My Beautiful Mother Like Smoke, The World's Richest Person - Chapter 26 - 27

Summoning ceremonies can freely call forth even “those which lurk in the depths beyond the gods”. One boy has top-level abilities even among the cutting-edge summoners who can use those ceremonies. He is Alice (with) Rabbit aka Shiroyama Kyousuke. But this strongest boy summoner has a single fatal weakness. Certain “cursed words” spoken by girls: “Help me.”

When Kyousuke hears those words from Meinokawa Higan, a girl brought to the verge of death, he throws himself into a city where three great summoner forces clash!

What do you do when your brother dies because of some entitled assholes? You go undercover.My real name? Clare. But at school, I’m Clause—just another guy blending in. Disguised. Watching. Yes, a boy. No, it's not an all-boys school—I'm just deep undercover, hunting down the bastard responsible for my brother’s suicide. Nobody—and I mean nobody—messes with my precious brother and gets away with it. They better pray I never find them, because when I do? Death will be a mercy, and trust me—I don’t do mercy.And as for the egotistical Alpha and the narcissistic Vampire Prince? They can go fuck themselves. I don’t do mates, I don’t do claiming, and I sure as hell don’t do them.

A door unfolded before him.Evil thrived, and whispers spilled from within.The resentful compound eyes flickered and vanished, the presence longing to burst out was blocked inside, and the alluring murmurs echoed in the ear.The sticky, pink brain mumbled something. A figure cloaked in a yellow robe watched from a distance. A dark green presence, smelling of blood, roared. A string of wondrous soap bubbles released friendliness—and many, many guests.They sincerely invited Lu Li to join this mad party.Lu Li stepped in, his stride resolute and unwavering.He had no reason to refuse.

Shaymon, the man who has achieved the apex of dark magic, is framed as being a Demon King and is killed.