Manga by author Suzuki Daisuke - Status ongoing

Fail-translated from the official summary: Kanaruzawa Sekai, "The God Who Lived A Thousand Years", is a beautiful girl with silver hair and red eyes. She's pompous and does not know much about her surroundings, and despite her childish appearance, she can tolerate alcohol and tobacco, and spends her day in her mansion reading books. Offered to her as a "living sacrifice" is high school student Kirishima Yuuki. As he was told she'd grant her one thing in exchange of being the sacrifice, Kirishima said: "Kanaruzawa Sekai-san, marry me." And so, they start to live their life together---but their days without peace nor love became disrupted, as the world began to be disordered due to a terrifying secret concerning the whole world. A comedically pure love, and a never-ending story begins here! The comicalization of the light novel "Monku no Tsukeyou ga Nai Love Comedy" starting right away!

From Angry Fox Scans: The story is about the Himenokouji twins named Akito and Akiko who got separated due to certain circumstances and after years of living apart they suddenly began to live under the same roof once again. Things were fine at first until Akiko began expressing her love for her older brother. Now Akiko must fight to defend her extraordinary love for her Onii-chan as she battles against all odds and three other girls who are after her beloved Onii-chan.

It tells the life story of Hayato Heiwajima ordinary guy occupation is the main successor of his grandfather and Heiwajima industries, the Maid Hatoko Heiwajima and close relative, is responsible to teach you how to deal with female and not so easily fooled. The problem is that her teaching methods go beyond the ordinary.