The game takes place in the Sekirei timeline, being played as a visual novel. Minato and the Sekirei in Izumo Inn encounter new characters consisting of Sekirei No. 54, Kuruse, Sekirei No. 57, Yahan, Ashikabi Reiji Koya and a baby referred to as Aka-chan. It centers around the discovery of the said baby, who is being pursued by unknown persons after Minato and the Sekirei found her abandoned in the city.

[from Wikipedia]