Accidentally Yours, Mr. Stranger - Chapter 1: Vow

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.

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

Chi Lang transmigrated to the Middle Ages as a third-rate magician in a third-rate magic academy. His magical aptitude is zero. But he has a good roommate.

His roommate is good-looking.

His roommate is good-natured.

His roommate helped him escape from danger several times.

His roommate never complains.

Chi Lang felt like he liked his roommate a little bit, and then his roommate helped him solve his ‘single’ problem.

It wasn’t until much later that he realized that his roommate was a remarkable figure.

——He was one of the demons sealed by the magician known as the “God of Magic”… And Chi Lang became the one who unlocked the seal of the Demon Lord.

- Description from Novelupdates

Probably Shy Loyal Dog Gong X Slightly Blackbelly Used Goods Shou

When a new neighbor moves in across from Chen Xiao, he sets his sights on the handsome young man, Gu MengYang. Though he’s coming off a bad breakup, he still wants to find love with a new man and wants to bully that man along the way!

Meanwhile, his fellow blackbelly friend from childhood, Luo Xin, noses in to “help” him catch his man. And, behind the scenes, tries to find a love of his own.