Can't the Star Plasma Vessel Become King?

I, Riko, was a Star Plasma Vessel who had been kept under close watch since childhood and lived almost completely isolated from the outside world. But during the summer vacation of my first year of middle school, I was unexpectedly summoned to another world by a goddess and became the chosen hero. After taking on all kinds of side quests, K.O.ing the mobs in my way, leveling all the way up to Lv999, defeating the Demon King, and successfully saving the world, I returned home in triumph! Though the magic I learned in the other world stopped working after I came home because I lacked MP, I still had the goddess's blessing and the body I'd built through training. Before long, some strange old men came knocking, saying I had to fulfill my duty as a Star Plasma Vessel and merge with Tengen, sacrificing myself for the world. I... No, this lady shall save the world once more! [The Star Plasma Vessel Incident] Scene One: After taking care of the people who came to attack me, a white-haired man in sunglasses and a weird guy with narrow eyes and strange bangs suddenly appeared. They looked at me with bizarre, unsettling expressions. Hmph, are you enemy troops planning a sneak attack? How dare you look down on me!? I slapped the white-haired man so hard he went flying dozens of meters, showing him who was boss! Weird guy with narrow eyes and strange bangs: ?! Scene Two: Standing in front of the Tombs of the Star Corridor, I didn't even look. With an offhand motion, I caught the bullet flying toward my head between my index and middle fingers, giving Geto a little taste of the shock of a Lv999 human. Heh, is that all you've got? I flicked the bullet right back the way it came, then flashed over to the boss. The Sorcerer Killer: ?! Scene Three: Standing before Lord Tengen, I didn't pay the slightest attention to what she was saying. Oh my gosh, what a gorgeous big sister. Cuddle time~ What!? This beautiful big sister has been imprisoned in this palace? (Wrong!) And she's burdened with a curse that makes her reincarnate every 500 years!? (Very wrong!) Got it. Time for a true love's kiss! (Shouting) Tengen: ?! I thought that once the crisis of assimilation was over, I'd return to a peaceful life and become an utterly ordinary person. But who could have guessed... A strange, blond young master came looking for me of his own accord, saying he wanted to take me as a concubine. When I turned him down, he seemed to get even more obsessed, constantly pestering me. I could always spot him sneaking around and following me. The Headquarters that had looked after me since childhood also revealed its evil side, plotting to make life difficult for me and planning to go after my friends. I helped set things right, and they all turned over a new leaf. They even declared that I was the only one suited to be Director, leaving the old orange so baffled when he rushed over hoping to claim the credit and take the position, only to find himself sidelined. On the road, I ran into a man with stitches across his head who looked like a human trafficker. He struck up a conversation, gave me a mysterious smile, and asked whether I'd be interested in becoming a clan head. The assassin I'd saved earlier was sprawled all over my sofa, asking if I'd heard the explosive love-triangle rumors currently circulating in the jujutsu world. Strange things kept coming at me one after another, and I also discovered that an even bigger conspiracy seemed to be brewing somewhere in the shadows, ready to make its move. If that's the case... To stop the world from being destroyed, to protect its peace, and to uphold love and truth, the adorable and fascinating hero makes her grand entrance! So, the first step to saving the world: Let's casually take over the jujutsu world! When the goddess summoned me to another world, she asked if there was anything I wanted before I set off. I said, then... give me courage. Grant me a heart that can overcome fear, and a soul that can keep moving forward without hesitation. Then I will face my enemies, return victorious, and come back here to make the beautiful future you foresaw a reality! This is... the vow [curse] I made to myself. Reader's Guide: * The story is narrated in third person. * After being tempered by another world, Riko has grown into a giant gorilla (crossed out), a great hero (serious face). * Expect some overpowered fun: Riko takes over the jujutsu world, and a chuunibyou girl saves the world! No one gets killed off! * Also expect a little SatoSugu love-triangle sandwich, hehehe. * Due to her age, Riko won't enter into any romantic relationships before adulthood... because JJ says no to underage romance! No! TAT So any romance will be one-sided! * A mountain of headcanons. ☆ Here's the upcoming story, Little Cat, You Can Summon an Undead Army ↓↓↓ Mortimer is a little wizard. After a magical mishap, he suddenly found himself in a completely unfamiliar place. Gazing at the towering iron spires he'd never seen before and the huge iron things rushing to and fro, Mortimer immediately used the magic he was best at: summoning the undead. A man who called himself Hyperion, the Ancient Dragon King, stepped out of the summoning circle. A moment ago, he'd been saying he refused to become a necromancer's servant, but the next, he fell silent. "The one who summoned me... is a cat?" The tall, muscular man in an ornate robe studded with jewels wore a complicated expression. Mortimer proudly puffed out his fluffy, snow-white little chest. What's wrong with being a cat? Can't cats summon an undead army? He's got a chance to become the greatest and most evil necromancer of all time, meow! With the help of his undead servant, Mortimer gradually settled into his new life in this world. Want something tasty? Send the servant. Want a comfortable place to live? Send the servant. Want to deal with some minor fluffy nuisances? Send the servant again. What, you think Hyperion might get overwhelmed if he's the only one doing all the work? Easy. Just summon some more. The Elf King, who had died long ago in the War of the Gods and had been pitifully summoned back from the dead by a necromancer, had been determined to resist to the bitter end. But when he saw all his old acquaintances gathered together to feed the cat, brush its fur, and fan it to keep it cool, he slowly formed a question mark. Hyperion, who'd only looked away for a moment and discovered yet another familiar face, this one his old rival, gritted his teeth. "Am I not enough for you? How many more are you going to summon?!" The long-lived races who came, drawn by the sudden eruption of overwhelming magical power over City X, all gazed at Mortimer with tears in their eyes. After centuries of being unable to have children, they had finally seen a living baby magical creature again! What a blessing from the heavens! But before they could try every trick in the book to lure Mortimer into coming home with them, they saw... "Your Majesty?!" X N Hyperion, the Red Dragon King, had been infamous in life for his terrifying reputation, cruelty, and love of fighting. He merely glanced at his subjects without a change in expression, then lowered his head and tried once again to sneak a sniff of the cat, only to be stopped by an utterly merciless barrage of cat punches. The long-lived members of the various races, who had seen a ghost (in every sense of the word), were dumbstruck. From them, Mortimer finally realized that he hadn't come to another world at all. He'd arrived 1,000 years in the future, after magic had been lost. No matter. It's the perfect time to let the people of the future witness the undead calamity led by the greatest necromancer in history! Mortimer bared his little evil fangs. Bonus Scene: Mortimer curiously examined his human hands and feet. Suddenly, the cat ears on top of his head twitched sharply, and he turned around, alert. Hyperion was standing silently behind him. At some point, he'd crept extremely close, casting a huge shadow that completely enveloped Mortimer. Mortimer planted a hand on Hyperion's soft, firm pectorals and pushed him back, warning him sternly, "Dragon, even if I've turned into a weak human, don't think you can lick me!" Feeling the touch against his chest, Hyperion's throat bobbed involuntarily. "Of course... Of course." As he spoke, his eyes remained fixed on the tail swaying between Mortimer's bare thighs. In the past, he'd only wanted to defeat the gods, rule the world, and enjoy that supreme power all to himself. But now... He wanted to be this cat's top cat, too. (P.S. In the world of cats, only the higher-ranking cat gets to lick the lower-ranking one.) [Beloved Cat Master Bottom X Former Overlord of the Old World, Red Dragon Servant Top] ** Theme: Fight for all that is beautiful in the world!