As a transmigrator, what do you do if you have no System, no pocket dimension, no wise old mentor, and no special talent to speak of?
Yu Qi says, "What's the big deal? I, Yu Qi, rely on myself!"
Type-Moon (Yu Qi): "Anyone who dares lay a hand on my sister will meet their end." The Root's teachings and World Runes are equipped. Shurima, I mean, Fuyuki City, your emperor is back!
Demons (Yu Qi): "What are you looking at? You're a dragon too. Artificial 'Longinus' Dragon-Eating Heart, Balance Breaker unleashed! Hand over all your power, for the sake of my great ambitions!"
Honkai (Yu Qi): "You're the Origin? What a coincidence, so am I! You wield authority, while I represent power. Good (True Self) and evil (Falsehood) have always been two sides of the End! So, my dear big sister, could you hand over your authority to me for the sake of this world?"
The Hidden World (Yu Qi): "Ahem, I think I found Hell and Heaven. You know what to do."
Naruto, Honkai: Star Rail, Pokemon, Digimon, Slime, Spider Girl, Saint Seiya, Gensokyo...
(All the Yu Qis) grab him by the leg: "Holy crap, boss! Give us 4K quality! I want to see the angel (demon) girls!"