masterpiece novel 4th grade mystery books

[Warning! #Yandere!] Aiden Cross was a boy who was smarter than a kid his age. Born on the seemingly normal planet Earth. Who finds his life very boring. 100 years ago, World War III happened for unknown reasons. Resulting in 25% of the world population perishing in this war and no one can talk about this due to the single organization which controls the world after the war. Does there lie a big secret behind the war that made all the previous nations fight for? Would he uncover the secret of the war? Or will he become a pawn of powerful organizations? But one day Aiden’s life turned upside down in an accident. Aiden lost his mother, and Aiden himself was on the verge of dying. Then he awakened the system and even met a beautiful yet haughty goddess. "You should feel honored you meet the great me hmph!" [Ding] [Compatible host detected] [Initializing the cosmic system] [Connecting the cosmic system to the host's soul] [Connection Completed] A system promises to make him stronger and help him revive his mother back to life. And inform him about the awakening of his world, which is no less than the apocalypse. With the help of the system, Aiden awakens Limit Grade Talent, but his talent is not complete and has a fatal side effect. [Talent: Celestial (unknown)] (incomplete) Aiden has to copy many talents to complete his talents. And travels to many different worlds. As he meets different races, a naive elven princess, prideful and lustful dragons, bored vampires, and a horny angel who offers herself to him  “I offer you my body and soul; please accept me." An angel with a flushed red face said  Unfortunately for our Aiden his big sis is a total yandere who couldn't even let him talk to another girl in front of her. Aiden has a dream of making a harem so he has to tread a careful line to get what he wants. Will he be able to have a harem or not? No one knows. But his otherworldly appearance wouldn't make it easier for him as he attracted many women's attention from a young age, which made his big sis even more jealous and crazy for him. Would he be able to have a harem in his long cultivation journey to revive his mother and discover many secrets of the cosmos with his yandere sister being present? Milfs, Virgins, Succubus, Vampires, Elves, Princesses, Demonesses, Angels, Goddesses, Dragons, Phoenixes, Dryads, Cultivation, System, Yandere, Otherworldly Handsome MC, and many more. _________________________ #No-NTR #No-Yuri #Yandere GOALS!!!! 200 power stones(weekly) = 1 extra chapters at the end of the week 50 golden tickets (weekly) = 2 extra chapters at the end of the week Donating Castle(or any other super gift) = 5 Chapters mass release(within 7 days) Join the Discord server at the link below to discuss the story. https://discord.gg/yD2GXRHHfp