Supreme Casanova: Ultimate Harem System - Chapter 19: Growth.

Kanzaki Ryoma transmigrated into the world of Tokyo Ghoul and began fusing with Uchiha Madara. Determined to bring an end to this twisted world, he chose to implement the “Eye of the Moon Plan” and ultimately activated the Infinite Tsukuyomi!

His Royal Highness the King of Han, who was afraid of the dark and ghosts and loved to cry, has always been the good baby of the princess.
Until one day, His Royal Highness the King of Han found a book in the bookstore…
Picture book?
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Search keyword: Protagonist: King of Han, Princess of Han

- Description from novelbuddy

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.

Qin Zheng transmigrated into the role of the Princess Consort, but Qin Zheng, an engineer dispatched to a foreign country, didn’t get the script for a palace drama, nor did she have the chance to experience the luxurious life of a Princess Consort. Because, the nation had perished. A eunuch held three feet of white silk and said, “Your Highness, the city has fallen. Please leave with dignity.” Qin Zheng: “…” What kind of beginning was this? In order to avoid being forced to commit su*cide, Qin Zheng had no choice but to go to the bed of her half-dead husband, the Crown Prince, and pretend to be deeply affectionate, shedding a few tears to delay time. Emperor Chu Chengji, founder of the Great Chu Dynasty, was valiant and skilled in warfare. He conquered the northern barbarians and drove out the southern savages, ushering in the prosperous era of Xuan Chu. He spent his entire life in battles, without a wife or concubines. Consequently, after his premature death, only a young scion from a collateral branch was selected to succeed him. He departed during the peak of his prosperous reign, only to open his eyes and find himself at the time of his nation’s demise! He was reincarnated as the current Crown Prince, his own nephew of many generations. Learning that the territory he had opened up in the past was directly lost, the Emperor of the founding dynasty couldn’t help but laugh in exasperation. How useless were these descendants? Back then, he could establish this long-standing empire single-handedly, and today, he could rebuild it! As for this stunningly beautiful Princess Consort, who cried so pitifully in front of him, the Emperor of the founding dynasty was extremely disdainful: “Women would only hinder his speed of restoration!” Later, the Emperor of the founding dynasty would knock on the door of the Pepper Room every night and ask, “Azhen, can I come back to sleep?”