How can I let go of the matter of saving my stepsister?

After waking up, Sato Yu traveled to Neon, a world where Neon ACG culture was not yet developed.
But if you look closely at his background, you will find that both his parents are dead, he has no car or house, and all he has is a step-sister who is a burden and has a terminal illness, and a cat-guest system that harms himself for the benefit of his step-sister.
[By making animations, you can accumulate fame points and heal your sister in stages]
"Huh? You want to trick me into working as a plantation slave in the animation industry? With the low level of entertainment in this world, if I had this much time I could just copy a few light novels from my past life and make a lot of money, and easily reach the pinnacle of life?"
She's just a stranger, a step-sister who isn't even related to me by blood, and you still want me to go to the trouble of trying to save her?"
Sato Yu scoffed at the impractical system.
But......
This stepsister would use her thin and pale hands to stir the wok and cook for him, would call him "Ouni-chan" in a soft and affectionate voice, and would warm his bed with her body in advance on cold winter nights.
Petite but reliable, weak but strong, so cute that people are willing to do anything for her.
After losing to this girl, Sato You smiled bitterly and opened the system again, but his eyes were firm.
"For my stepsister, I have no choice but to do it."
"Animation Master!"