Welcome to the Little Garden, where people band together in like-minded clans, parallel realities intersect, and the truth of stories comes to life! The masters of this world host the Gift Games, in which extraordinary prizes may be won and lost by gods, spirits, monsters, and people of extraordinary ability. One dwindling clan has lost even its own name in the Games, and seeks new talent to make a comeback. Black Rabbit, a games referee, has brought Izayoi Sakamaki, Asuka Kudou, and You Kasukabe, three individuals with unique abilities, to this world to help return this clan to its former status. For the struggling clan, the stakes have never been higher; but are the newcomers just out to make a name for themselves, or will they really help the clan succeed?
Both Mondaiji and Horizon have similar mystical systems. In both cases many derive their powers by linking their identities with legendary historical or mythical figures. Roger Zelazny used a similar concept in his novel Lord of Light which he called "Aspects," that "strengthened their bodies and intensified their wills and extended the power of their desires into Attributes, which fell with a force like magic upon those against whom they were turned."
Their socio-political power structures are similar as well where "Gift Games" or "History Recreation" events are contests of various sorts that determine the influence the various factions can obtain.