If you're looking for manga similar to Kyoukai Senjou no Horako-san: Shucchouban, you might like these titles.
The 506th Joint Fighter Wing; a squadron of witches tasked with protecting innocent people from the Neuroi following the liberation of Gallia. These Witches are referred to as the "Noble Witches" because of their social status and their dedication to serving the needs of the less fortunate.
Hideo Kawamura has a really terrifying look, but soft heart. While contemplating suicide, he stumbled upon this computer that contained the virus, "Wiruko", who convinced him to join the "Seimahei", a fighting tournament that has the world as its prize. However, Hideo happens to not have any fighting skills whatsoever, so he has to get through on his wits (and luck) alone.
Begins with the arrival of the "Enemies," giant, indestructible monsters that cannot be negotiated with. The Enemies drive humanity to the brink of extinction. A lone boy stopped them with his "moonfall strategy," but he disappeared soon after. After three years, a boy known as Kyle Kamishiro appears on the outskirts of a city. When monsters attack again, he demonstrates the power to manipulate the odds of probability. Despite his efforts, he is afterward drafted into the "Guilty Children," a unit of children who are guilty of crimes.
The story revolves around Objects — powerful, massive weapons that change the course of warfare — and Elite Object pilots. An odd Elite girl named Milinda meets Quenser, a student who aims to become a Object mechanic, with the soldier-in-training Heivia on a snowy battlefield
Once upon a time, a creature named Enka tried to destroy everything on Earth. It was eventually slain by humans; but before dying Enka proclaimed that one day its child would return to the planet, spreading fear and despair throughout all humanity. Now, thousands of years later, DNA tests have identified six 'children of Enka'. Only one of them is dangerous, but nobody knows which one (and killing them all would be mean!) Instead, 'Operation Cozy Family' is born! Normal human Ouka Midarezaki is forced into marrying Kyouka, one of the children of Enka; and together they play the roles of 'father' and 'mother' for the other children. But will family bonding and love really be enough to prevent the destruction of the planet?