Halley's Comet Takes Me to a Higher Dimension

[The heroine travels between planets and clears dungeons + creates worlds and builds civilizations in a universe-creation game to become a god + the hero is a sunny, golden-haired, blue-eyed, silly puppy who is super clingy with the heroine] July 28, 2061: the day Halley's Comet returned. Pei Ban woke up groggily in a train carriage and found a golden-haired, blue-eyed young man sitting across from her. When he noticed her looking, he seemed to have found his savior and immediately grabbed her hand. "Hello, I'm Halley's Comet. I'm trapped in this body and can't get back. Could you take me to find someone and pay my fare? Once I return to the sky, I'll definitely repay you!" "..." Pei Ban pried his fingers off her hand. "Who are you looking for?" "I can't remember either. I only know they're someone very important," the young man said earnestly. "But when I saw you, I knew you could help me find them!" Pei Ban called over a security robot with an expressionless face. "Hello, this person is a scammer." As the security robot dragged him away, the young man hugged her leg and refused to budge. "You have to believe me! I really am Halley's Comet!" "Fine, add one more charge: sexual harassment." * One day earlier, Pei Ban had been bound to a strange System. It said it was an Ascension System, and its goal was to help Pei Ban evolve from a three-dimensional being into a seven-dimensional being. Pei Ban: "...Huh? Me? Ascend dimensions? Is this for real?" [It sure is, dear!] [But crossing dimensions is an impossible challenge for three-dimensional beings, so the System has specially arranged an Ascension Companion for you~] Later, Pei Ban stared at the golden-haired young man clinging to her leg like a burr, veins bulging on her forehead. "This is the reliable Ascension Companion you were talking about?" [Ascension Companion delivered. Host, please prepare to enter the multiverse trials. Clear the trial dungeons to gain Ascension Authorization.] "Hello? System, can you hear me? Can you get me someone else?" [Additionally, during the breaks between dungeons, please build a brand-new interstellar civilization, starting with creating a planet.] [Your civilization rating will affect your final ascension assessment.] Some golden-haired guy: "Wow! Pei Ban is amazing!" Pei Ban: "...Shut up." * Halley's Comet orbits the Sun once every 76.1 years. It is the only comet that humans on Earth could potentially see with the naked eye twice in a lifetime. It is Halley's Comet, a seven-dimensional being by nature. The comet is merely its "body" in four-dimensional spacetime. In 2137, as it passed perihelion, it unexpectedly sensed that a human from Earth, a three-dimensional being, was trying to ascend to a higher dimension and become one of them. But just before she succeeded, her body and soul both dissolved into points of light and vanished into the universe. She had failed. Amid the burst of energy released as a living being died, it saw her most precious memories. They were all little moments spent with its three-dimensional projection. It remembered every moment of its existence across billions of years, yet it couldn't remember when it had ever shared a past with a human like her. Perhaps its long life had grown too boring, or perhaps it regretted the loss of a newly born companion. It reversed time and returned to Earth on July 28, 2061. It returned to the day they met. But this time, the future that had once been set in stone was about to change. "Welcome to the Ascension Game" "Planet Projection app loading" "Please complete the multiverse trials to obtain Ascension Authorization" "The Universe be with you for infinity" * Dungeon One (Earth): Escape from an out-of-control underwater train set to self-destruct Dungeon Two (mysterious planet): Preserve the spark of the Mars civilization Dungeon Three... More planets are being unlocked, and Pei Ban's own planet is under construction! P.S. The cover features Halley's Comet's three-dimensional projection. The character profile includes the heroine's ordinary human form. Theme: Science is power