This definitely piqued my interest as the settings of this are a bit different than the normal end of times genre. It's like a mix and match of end of times and contracting monsters. Definitely a unique perspective, so it's a must-read to me.
Basically, the settings are at the end of times, as I said. But instead of elemental and physical powers, you can contract a monster. Who are these monsters? Could be your friend, family, or even pets if they didn't survive the evolution.
To be able to contract, you must be the one who killed the monster. Or else you won't be able to contract it. It has levels, and at every level, you get a new contract slot for a new monster. You'll face a challenge to get that spot for your next monster. A sacrifice. Interesting, isn't it?
The protagonist is also a stable character. He's not a holy father but a calm and well thought out character. He understands that what matters the most is his strength. With it, he will be able to speak within the group and have more use of his special ability. I would say that particular ability is OP, but it has its own rules and limitations.
He will also expand his group and area as he gradually builds his strength. It's addicting to see how they've come now. The group also doesn't drag him down. Instead, they pushed themselves to their limits and works to contribute. They put the protagonist at the center as they know he's the center of their place. Without him, they won't have what they have now.
The exploration of why this happened is also there, albeit slowly since this is the main plot. It's fun to see that there's progress every now and then.
Overall, I love this, and I'll continue reading this until the end possible.