MTL - USSR 1941 - Chapter 76 line of defense

What was originally an ordinary day, suddenly became a historical turning point. Enormous, mysterious Cubes appeared all over the world without warning and as if Judgement Day’s spears, inserted themselves into the blue planet.

From inside the enormous Cubes, endless streams of monsters gushed out alike raging tides, utterly defeating the unguarded armies of each state in the blink of an eye.

In order for humanity to preserve its final embers, the heads of states issued orders of retreat, to no longer attack the Cubes but rather to cling to remote cities, which they turned into self-sufficient survivor bases and around which they built 100-meter-tall Walls of Life!

Many years later, while bearing the heavy weight of history, the first expeditionary force brought back a world changing piece of information. The Cubes possessed exceedingly high intelligence and they regularly transmitted mission instructions to humans nearby. The mission rewards were incredible.

Since then, humans rushed out of the confines of the walls and once more set foot on the wasteland!

- Description from Novelupdates

Transmigrating into a Cultivation World full of crises, Shi Nian just wants to lie flat and survive until she dies of old age.However...Why do the fellow disciples around her all seem a bit off?The aloof senior sister is a vicious supporting female character, and in the end, her own partner extracts her soul and peels her bones just to save a mortal woman.The gentle second senior brother is a tragic character; his childhood sweetheart fiancée claims she and a poor boy are true love, and eventually, that poor boy breaks in and cripples second senior brother's cultivation.The cold third senior brother is obsessed with swordsmanship and has eyes only for that, but the female lead clings to him obsessively, saying she loves only him. The male lead is jealous because of this, and third senior brother is schemed against and dies pierced by thousands of arrows.The kind junior sister saves a tiger demon, who professes admiration for her, but in the blink of an eye, throws her into the Abyss for the sake of the female lead, causing her to fall into demonhood, ultimately dying tragically under the Righteous sword.Shi Nian is shocked to realize she has transmigrated into four books at once.And all her fellow disciples are the villains in the books...When a group of protagonists righteously come knocking on the door.Shi Nian, who has been lying flat all this time, suddenly realizes.Huh?When did she become invincible?

Grace Lightsinger is just a simple farm girl.Ever since the death of her parents, she's been taking this slowly, one day at a time. That changes when she dies protecting a stranger. But instead of a peaceful afterlife, she finds herself reborn as an angel with a mysterious “Saintess System” that no one else can see. She's made to choose between three factions of gorgeous immortals: warrior angels who fight demons, healer angels who tend the wounded, and love angels who raise morale through very intriguing methods.However, unlike other angels who can only master one path, Grace discovers she has an affinity for all three. This hasn't happened since the goddess Eternia herself walked the heavens, which leads to Grace learning that she might be more than just a regular angel. She might be Eternia's chosen successor, herself.But not everyone in heaven is happy about Grace's arrival. The scholarly Choir questions her legitimacy, fallen angels show dangerous interest, and that's not to even begin talking about the demons she'll be fighting.Grace wanted a peaceful afterlife, but between training, fighting demons, and trying not to die of gay panic, she's about to discover that heaven is a lot more dangerous than she ever imagined.

An alien race invaded the Earth on June 6, 2128. At the midst of this war, many nations allied with the alien threat and the war nearly wiped out the rebelling humans of the planet. At the edge of mankind's survival, the United Nations Army launched its forces to eliminate the immediate stellar threats that loomed over Earth.

General Seeker Carlean, commander and leader of the mission, risked and gave his life to destroy the immediate stellar threat. The battle was won though Earth lay in ruins. Perhaps mankind will live to see a few years of peace before the alien threat returns to wipe out their existence.

At the immediate aftermath of the stellar battle, the fallen Seeker Carlean awakens and finds himself at aged 17, living the peaceful life he lived 16 years before he died.

So begins a new game in the battle for humanity's survival.