After twenty years bedridden with illness, he transmigrates into the body of a little girl.
The good news: his golden finger is the system from the martial arts game he played in his previous life.
The bad news: he played a game about little girls... Fortunately, everything that should be there is there, and everything that shouldn't be is missing.
At first, Wen Chi thinks he has transmigrated into a martial arts world. But on the tenth day of working hard to level up, a little villain falls from the sky, and Wen Chi realizes that he's actually transmigrated into an apocalypse novel!
The little villain has a tragic background and terrible luck. During their escape from the apocalypse, his parents sacrifice themselves for their group, only for the group to abandon him over a cliff moments later, calling him dead weight. The icy spring at the bottom of the cliff, which saves his life, awakens his powers, and gives him the strength to take revenge on the world, was turned into a hot spring the day before when Wen Chi used a fire-element gemstone from the game system.
Guilty as charged, Wen Chi shakily offers him a bird's egg he just fetched from a tree. "Want a hot spring egg?"
The little villain, who has just lost his trust in humanity: "...Sure."
With the extreme-cold arc fast approaching, Wen Chi, a dependable adult, decides to shoulder his responsibility. Despite being half a head shorter than the little villain in the loli body size set by the system, he boldly declares: "Don't be afraid. I'll take care of you!"
Wen Chi keeps his word. In his previous life, he was a clueless, big-spending player who loved flashy character cosmetics, but all that money he spent wasn't wasted. After transmigrating, his character level and cultivation are reset to zero, but all the outfits, mounts, weapons, items, and housing blueprints he bought are bound to his character!
Best of all, the game's inventory is basically a spatial ability, and the game home is like a portable space. It has no spiritual spring, but he can grow crops and raise livestock there! It's more than enough to care for one little villain!
In the lifeless, extreme-cold apocalypse, Wen Chi keeps himself and the little villain healthy and chubby. His only worry is that, with the system having defined his body as a little girl's, he may be stuck as a shorty for the rest of his life.
But it's no big deal. Short people are cute too!
In the first year, the little villain is half a head taller than Wen Chi.
In the second year, the little villain is a whole head taller than Wen Chi.
In the tenth year, the little villain has to crouch down to talk to Wen Chi.
When Wen Chi realizes that the grown-up little villain is looking at him with an increasingly burning gaze, he finally panics. "Don't come any closer! Pedophiles get shot!"
The little villain doesn't want to get shot, but he won't let go either. His eyes red, he clings to Wen Chi. "Big brother, save me."
Wen Chi is close to tears. "Can you let me grow taller first?!"
To stop the little brat he raised himself from really turning into a pedophile, Wen Chi decides to find a way to change his body size... How is that any different from delivering himself right to the villain's door?
* A sweet, one-on-one apocalypse romance
* Wen Chi is the bottom, the little villain is the top
* Wen Chi's body will level up to an adult size; the romance begins once he's grown up.
* Various original worldbuilding details, including wasteland elements
Theme: Love can overcome the loneliness and disasters of the whole world.