Been thinking about this for a bit since the manga's discontinued
Author mentioned the story is based on the cosmic censorship hypothesis, which basically states the insides of a singularity (Ex: black hole) can't be observed by someone outside "infinity" (or an event horizon). Another way of looking at it is the insides of a singularity break determinism/physics in some way so the fact the world we know is deterministic proves that the insides of all singularities are "censored" from the rest of reality somehow.
There's several ways to apply this to the story:
- Cosmic censors can't observe their futures because they possess singularity-based powers. They can also change a pre-observed outcome due to breaking determinism.
- The fact that the cosmic censors restarted the universe over and over with the MC dying each time implies determinism, so the Earth is not inside of a singularity.
- It's mentioned that the invaders are trying to destroy the world via turning it into a black hole. However, a black hole is a weird choice to destroy a "world" with and the cosmic censors can lie. Given the "reset the world" theme, the invaders might be trying to create a white hole (naked singularity) instead to break causality, creating possibilities for a new universe different from the current one.
In any case it's a conflict between "people who want to change the future into the best outcome" (cosmic censors) and "people who want to restart everything for an entirely unpredictable but different future" (invaders). The issue is an entirely new reality might fix unfixable problems in the current reality but create many more unforeseen issues, going against what cosmic censors stand for. However if someone is determined to fix that one issue and completely doesn't care about all the other issues then it's the perfect solution.
Anyways I enjoyed the story and didn't have many issues with the writing. Concepts are unique, very clearly a work of passion. Maki was slowly becoming more involved instead of volunteering to be dumped in the deep end, which makes her character consistent. I don't like to judge mysteries before the end of a story so I won't comment on that; I would say I do like the steps of slowly building it up though. Given how secretive and professional everyone is I would be disappointed if the answer was revealed so early.
Hopefully the story continues in the future.