Honkai: Star Rail: Life Simulation, I Become Yao Guang's Childhood Betrothed from the Start

[Non-main-story, multiple original characters, OOC, mostly slice of life]

After a nuclear war, civilization on Earth has regressed and monsters roam everywhere.

Heng Yu unexpectedly binds to a "Life Simulation" System, entering different life scenarios and receiving rewards upon completing them.

In the first scenario, a woman named Yaoguang picks him up.

Yaoguang: "Your big sis is so beautiful. You're lucky to have me."

Heng Yu: "...If it's such a good deal, how could I refuse?"

Second scenario: He becomes a student at the World-Painting Academy and gets into a huge fight with a girl named Himeko over the chance to reach the "Throne of the Peak."

Himeko: "You're the transfer student? Come on, let's fight for the throne!"

Heng Yu: "Bring it on. Attack me with your strongest weapon!"

Third scenario: He saves a cool, beautiful woman named Jingliu.

Jingliu: "We have nothing to hide between us. We can both hold our heads high with a clear conscience."

Heng Yu thinks these scenarios are all virtual worlds created by the System.

Until one day, dozens of starships arrive in the Solar System and quietly take up position beyond Earth's orbit. One after another, the heroines from the scenarios come looking for him...

Yaoguang: "Sob, sob~ You really had the heart to leave your big sis behind for so many years."

Himeko: "Take my hand. Let's head for the stars together."

Jingliu: "I've come to fulfill the promise I made back then."

Ms. Herta: "Come on, say it again: Ms. Herta is peerless."

Heng Yu's eyes widen. "You actually exist for real!?"

His younger sister excitedly tugs at his sleeve. "Big bro, there are so many, so many sisters-in-law!"