goofy_goober

Kazuma Hoshino is a young student who, in the company of his younger brother Ayumu, move from undisclosed urban Japan into the rural city of Yamabiko. On their way to Yorozuyo Inn, where they are prearranged to lodge, the boys get on the wrong bus, forcing them to wait out the next ride at a stop.

The series is set in an alternate reality where a new, women-only, gambling sport known as "keijo", quickly becomes a fad in Japan since its introduction in the dawn of the 21st century. Keijo matches are held atop floating platforms in large water-filled stadiums where bikini-clad players fight to incapacitate their opponents or push them out to the water, but they can only hit each other using their breasts or buttocks.

The Shirakiin house's daughter, Shirakiin Riricho, who has a complex about being unable to live independently and unprotected, feels the need to move out and live on her own under the condition of residing in the mansion named "Ayakashi Kan." In this mansion, only those who have cleared a very strict examination could reside in it, and for each resident, they are accompanied with one agent of the Secret Service (S.