Ichiban Ushiro no Daimaou - Volume 7, Chapter 4 — A Fairly Large Battle

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

Alexander, a world-class sales training expert and a holder of the Social Tyrant certification, found himself transported to a parallel universe, entering a world that seemed straight out of a horror story.

However, this world wasn't as terrifying as he had initially thought. In this realm, being a social maestro meant you could do almost anything you pleased.

Leveraging his exceptional social skills, Alexander turned even the most fearsome ghosts into friends. Moreover, as his rapport with them grew, he received additional rewards.

Affinity Level 60

Headless Ghost: “If you like, I can give you this head as a keepsake.”

Affinity Level 100

Female Ghost Teacher: “Darling, stay with me tonight, and let me show you what the Ice and Fire truly feel like!”

……………………………………………………………

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“Congratulations, you're now a Handler. You'll serve the state with utmost loyalty and pledge your life to its causes.”That was what Trent heard just before being handed an envelope—and a whole lot of disrespect.Mocked for his poor combat performance and labeled pathetic by his superiors, Trent finishes Handler training humiliated and underestimated. But they made one mistake: they judged him by his strength, not his mind.What Trent lacks in brute force, he makes up for with a rare genius in finance.So when a mysterious voice speaks to him in the bathroom—“Hello, Host. This is Ave-511e69.”His world flips upside down.Now equipped with Ave, a mysterious financial system that seems to know everything, Trent is about to rise through the ranks in a way no Handler ever has.Through stock markets, black-market missions, and calculated chaos, he will prove that money is the greatest weapon of all.They looked down on him. Now, they’ll look up in fear.

In a normal and average modern world where a prestigious academy nurtures elites in a certain field who are known as ”Supreme“ such as [Supreme Inventor], Allen Walker suffers from being called 'average'. Allen Walker can't accept why he has to be average when a few are fortunate to be born as either a genius or prodigy. After a week of self-loathing, when all of his hope was lost, a sound snap him back to reality, or is it insanity?

Ding!

[A suitable host has been found! Prodigy System at your service!]

Ding!

[Hello darling! Chuu~ Harem Protagonist System at your service! Or do you want my service in bed instead?]

Ding!

[A wild Anti-loner System has appeared!]

Ding!

[Fiction fanatic, praise thee and thou shalt be graced with the Multiverse Traveler System!]

Ding!

...

Before Allen can even choose a system, another too familiar sound harassed his ears.

Ding!

[For achieving a thousand system requests which are a one in a decillion chance to occur, a Supreme Being was forced to use Divine Intervention.]

[Merging all of the thousand systems to create the most versatile and advanced system... Merging complete! Alternate Multiverse Chat Group System has been obtained!]

After accepting the Alternate Multiverse Chat Group System, Allen becomes a prodigy and the Chat Group's Admin and has no choice but to chat with beings from other universes.

Beings with suspicious, delusional, and eccentric names such as [I Love Mathematics], [Lolicon Shota Cultivator With Soul Fetish], [Sword Forge From Chaos], [Self-Proclaimed Genius Goblin Hero], [Reality's Bitch], [Time Manipulator Of The Apocalypse], and [Delusional Modern World Chuunibyou]

The chat group introduces Allen as [Supreme Order] as he chats with the otherworldly beings to find out the secret behind the Alternate Multiverse Chat Group.