MTL - Never Fade Skull Flag - Chapter 573 Negotiations with the Mermaid

You know what’s great? Turning eighteen.You know what’s not so great? Opening your eyes to a room you don’t know, followed by the world's most intense headache.This is how my story started. Where it goes from here is anyone's guess.---This is a Pokemon fanfic about a girl that gets brought into the Pokemon world from Earth.---This is my first time writing a fanfic so take it easy. Helpful criticism is appreciated and I may ask for suggestions but in the end I am writing this because I want to. I'm not sure what tags and genre will encompass this story but I will update it as it evolves.

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.

She never dreamed that she would meet him in the bathroom and they...Five years ago, she betrayed him for some reason and chose someone else, which deeply hurt him and he swore to make her pay the price. After the reunion, he launched a fierce attack on her, while she tried to escape this emotional entanglement.However, the red line of fate seems to have already tightly connected the two. Through repeated interactions and confrontations, they gradually uncovered their past misunderstandings and got to know each other again. His deep affection for her remained, and she was gradually moved by his sincerity.

What would you say is the most valuable thing in this world?