In class Abe is playing with his smartphone when it is snatched by his female students and they found that he likes Adult Videos. Disgusted by this discovery, his classmates are trapped by a entity who appeared from his smartphone and are forced to make an Adult Video with Abe as the director of it.

The story begins when the reserved Shizuka attends a local mixer party but has trouble adjusting to the atmosphere. A beautiful older female college student named Ryou starts talking to her, and the pair hit it off. Shizuka goes to spend the night at Ryou's place. However, Ryou unexpectedly kisses Shizuka and pushes her down. Shizuka thinks the beautiful woman is a lesbian but soon discovers that Ryou is actually a man dressed as a woman.

Saigo Takamori, the hero of the Meiji Restoration, was born to a poor, low-ranking samurai family in the Satsuma domain (present day Kagoshima Prefecture). His simple honesty caught the attention of its charismatic feudal lord of Satsuma, Shimazu Nariakira. Nariakira’s assertion that the love of people is what will enrich and strengthen the nation captivated Saigo who took on Nariakira’s secret mission and eventually became a key person for Satsuma. Not a portrait of him survives today and much of his life is a mystery. He is a man who was twice exiled and thrice married. He overthrew the Tokugawa Shogunate with exceptional bravery and action. Although he accomplished the restoration, he lost his life in a fight with the new Meiji government.

Reika Shichijo was a student at the top of her class, until one day she suddenly became a dropout. Now she is responsible for her classmate Niimi-kun's sexual pleasure to help him "study" better. In this world "Dropouts", those who have failed to be admitted into university, are forcefully made to work. Especially beautiful students are obligated to pursue sexual labour AKA become sexual servants to the rest of society. Reika becomes the sex slave of one of her former classmates, Niimi-kun. She is now tasked with relieving his sexual tension, so he can study better. During their time in school Niimi-kun will have to adapt to his senpai becoming his new "study" partner, find out why and how she became a dropout and deal with the jealousy of his peers, especially Reika's ex-boyfriend, Shiroshima.