Daimon Michiko is a 37-year-old freelance surgeon who is part of a questionable “doctor placement service” that has her wander from hospital to hospital. The harsh environment at the hospitals led many doctors to retire from their positions, forcing hospitals to make use of said program to fill the empty spots at least temporary. However, Michiko doesn’t look like a doctor at all with her flashy clothes and eccentric attitude. In the first episode she raises objections to a certain operation which is planned to be done by the head of a hospital who hasn’t performed an operation for a very long time. This causes Michiko to incur odium at the hospital, however, everyone becomes frozen when Michiko points out the outdated skills of the director. She also holds a scrupulous compliance when it comes to her working hours, never does any unnecessary chores that don’t require a medical license, and couldn’t care less about the power struggles within the hospitals. Nobody knows how she acquired such a top-level skill that allows her to claim exorbitant sums as reward, but her private life is an even greater mystery to everyone around her. Tanaka plays a rookie surgeon, Uchida an anesthetist, Kishibe the head of the placement service, and Ito the head of the surgical department of this institution.

La Academia de chicas Achiga en Nara derrota a la escuela Bansei en el torneo regional de Mahjong, consiguiendo avanza a las semifinales nacionales, pero pierden ante el eventual campeón, y el club Mahjong de Achiga se disuelve. Seis años más tarde, la estudiante de escuela primaria Shizuno Takakano se hace amiga de Nodoka Haramora. Las dos entran en la Academia Achiga pero Nodoka es trasladada en el segundo año. Cuando Shizuno ve a Nodoka en el campeonato individual nacional de escuelas intermedias de Mahjong, decide revivir el Achiba Mahjong Club.