The World of Otome Games is Tough For Mobs - Volume 8, Chapter 4 “Collar”

The hidden dragon stirred from its sleep, the fierce tiger descended the mountain! Ye Wudao, following his master's orders, crossed into the mortal world, his medical skills so advanced they could reverse fate, his divine magic alone dominating the universe. Whoever dared touch my dragon scales, regardless of their power or status, was met with instant death!

The aliens came with hostility.
Facing the invasion of aliens, human beings are weak like ants.
So this is the end, the real end.
But there is resistance when there is an invasion.
For some, this is not the end, it is war.
So this is war.
Real war!

- Description from Qidian

On a certain day, a certain thought came to Japan’s Sun Goddess. ——Aren’t there too many Japanese people being abducted to other worlds? It’s true that the large majority of Japanese are diligent and docile and soft-hearted, which makes them pretty much the best people to ask for favors. “But recently it’s just gotten way too out of hand…… Oh, I’ve got it! Whenever a Japanese person is summoned, I just have to summon an otherworlder!” And now, every time a Japanese person is summoned, princesses and elves and beastmen and whatnot are reverse-summoned. Under the acknowledgement of the government, they begin living in Japan. Today, too, Japan is at peace. And so begins this laidback isekai cultural exchange story♪

They are childhood sweethearts, they are engaged under the family’s scheme, and they have to live in the same room and sleep together.

That night, she was accidentally drunk, and he kissed her in a fascinating mood,. By accident, his “crime” was finally discovered, she accused him, but he said with a smile, “You are my wife, why can’t I kiss you?”

The two people’s daily routine is full of bickering, mutual hate.

He said that he disliked her. Actually, In his heart, he was extremely caring of her. When she was close to other boys, he was so jealous that he wants to tie her to his side and become exclusively his.