Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 16 - 16-9. Sera's Resolution

There’s nothing that Yu Wan has in common with her new neighbor– whether it’s charisma, personality, or cooking skills– other than that they both own dogs. Their two cute pets get along well (a bit far too well) and start what seems like a rocky friendship between the two; however, Yu Wan has more important things to worry about. Her wildly popular novel is about to take off into a drama adaptation, but the handsome, mysterious, and callous neighbor- is the director?!

Shen Qingzhou (as he thinks of someone): I’d say three. ]

- Description from Novelupdates

Chen Chuan has transmigrated into a martial world and today is the day when he takes his entrance test for the most renowned academy in his city.With no prior martial training, his confidence stems from his second self, capable of absorbing damage and enhancing the power of his strikes.

Dale Mitchell, your average guy in a below-average job. But, what happens to him is anything but average. After hitting someone in his truck, his world was turned upside down, inside out, and more than fifty shades of grey.

Now, he seems to be something called a World Keeper, and must create and manage his own world. Is this his afterlife, or something else entirely?

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.