MTL - The Princess Wei Yang - ~ 276 unexpectedly

The protagonist wakes up to a superpower one day, out of the blue! But there’s no organization targeting the protagonist’s superpower! The prettiest girl in his grade doesn’t turn out to be a psychicer like the protagonist himself! No door opens to another world and he doesn’t get summoned! There is no secret history in the protagonist’s past! There is no reveal explaining the protagonist’s sudden attainment of his superpower! So normal! Such overwhelming normalcy! He graduates from school and gets a job without anything happening! He lives as a mediocre working adult! Having enough power to fight against all of humanity yet not seeing anything happen finally makes him snap! Fine, be that way! If this is the way it’s gonna be, then I’ll make it! I’ll make the secret supernatural organization myself! Welcome to my manmade extraordinariness!

Meet Sora and Shiro, a brother and sister who are loser shut-ins by normal standards. But these siblings don’t play by the rules of the “crappy game” that is average society. In the world of gaming, this genius pair reigns supreme, their invincible avatar so famous that it’s the stuff of urban legend. So when a young boy calling himself God summons the siblings to a fantastic alternate world where war is forbidden and all conflicts–even those involving national borders–are decided by the outcome of games, Sora and Shiro have pretty much hit the jackpot. But they soon learn that in this world, humanity, cornered and outnumbered by other species, survives within the confines of one city. Will Sora and Shiro, two failures at life, turn out to be the saviors of mankind? Let the games begin…

The fat and ugly Nora Smith is the laughingstock of the town when her fiancé breaks off their engagement.