MTL - General: Traveling Frog, Starting Blood and Following the Limit - Chapter 550

The end of the world is coming, the world has undergone great changes, and everything has changed. Plants, animals, and even insects, as long as there are living things, have mutated.
Become more powerful, and even evolved supernatural abilities, such as chickens and ducks that can fly to the sky, such as cats and dogs that can breathe fire.
But only humans, without any obvious changes, seem to have fallen from the top of the food chain to the bottom of the food chain overnight.
Any creature that can open its mouth to eat can treat humans as food.
But fortunately, this world has not completely killed humans. Gradually, humans discovered that they had the ability to cultivate compatibility with other creatures.
As long as it has a high degree of compatibility with some powerful mutant creatures, it can be used for its own use to achieve the purpose of protecting itself.
Fang He is a person who is very compatible with mutant animals, but it is also because of his ability that he has changed from the strongest to the stupidest.
Fang He, who was reborn, said, “Hmph, this time…”

- Description from novelbuddy

Ryzel, a nineteen-year-old guide, was expecting to marry Dwight, but the man changed his mind a month before the wedding.“I’m sorry, Ryzel.I wanted a nice and compassionate wife, so I am going to marry Sean instead.Unlike you, who were usually preoccupied with other things, he always showed concern for me.Not to mention how highly compatible we are with one another.I've actually met him before, but he persuaded me to date you because he feels sorry for you.”Without even waiting for Ryzel's response, the man left.Ryzel, who was left behind, can't even bother caring about his heart because he's been dealing with a lot of issues as a result of the sudden rejection.He was turning 20 in a month, which meant he had to be married according to the federation's laws.After he reaches the age of 20, the government's assistance will cease, leaving him to fend for his own expenses.If he is not married to a powerful sentinel, he will not be able to reclaim his inheritance and will be forced to die on the front lines.He instantly began looking for solutions, but his hope kept dwindling as his birthday approached without a proper solution to his problems.On the day he felt all hope was lost, his ex’s superior, General Lewis, proposed to him.“I'm not gentle and kind; my priority probably won’t be you; our compatibility may not be high; do you still want to marry me?” Ryzel questioned, fixing his gaze on the general.“It's okay, I don't need my wife to be gentle and kind. Our compatibility is also high. You can focus on your studies, job, or dreams. As long as you remember that you are my guide.”“Okay, let’s get married.”------------------------This is the story of Ryzel's advancement in career and love life, even with all the troubles surrounding him.

Weird stuff keeps happening in my life lately.

Like that solar eclipse on that morning, or this dude who says he is my roommate. Oh and that this place that I suddenly found myself in isn’t Earth. And even more, I can do magic?

I don’t know, maybe I have finally gone crazy…

Our protagonist Caam is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself.