Satoshi Osugi appears throughout the *Eden of the East* narrative, including the television series and the sequel films *The King of Eden* and *Paradise Lost*. He is a core member of "Eden of the East," originally a group of university friends running an image recognition app and recycling business. Osugi harbors persistent, unrequited romantic feelings for fellow member Saki Morimi. This fuels jealousy and distrust toward Akira Takizawa, leading Osugi to denounce Takizawa's character during the series. He falsely accuses Takizawa of orchestrating the "Careless Monday" missile attacks and abducting 20,000 NEETs. These accusations are later proven incorrect, resulting in Osugi's public humiliation. In *The King of Eden*, Osugi remains involved with the Eden group, now a more structured business actively searching for the missing Takizawa. He participates in group efforts monitoring the Seleção database and supporting Saki Morimi during her trip to New York City. His specific actions in New York are not detailed, but his presence is consistently noted among the Eden members coordinating remotely. Osugi's role becomes more directly involved in *Paradise Lost*. He physically accompanies Saki Morimi to locate Takizawa's mother, Aya, who operates a bar. This task supports Eden's efforts to uncover Takizawa's origins and counter other Seleção schemes. Osugi aids Saki in tracking down Aya, demonstrating continued loyalty to the group and Saki despite his romantic setbacks. After their brief encounter with Aya, she flees when police arrive, prompted by Seleção Daiju Mononobe. Throughout the narrative, Osugi is characterized as a loyal, albeit occasionally petty, member of the Eden group. His initial hostility toward Takizawa evolves into reliable, though often background, support within the team's operations. He consistently contributes to Eden's objectives, including their transition into a successful business and involvement in the broader conflict surrounding the Seleção game.