On "Careless Monday," November 22, 2010, Japan was targeted by missile attacks as part of a terrorist plot that thankfully resulted in no casualties. The incident quickly faded from public consciousness, and society returned to its normal rhythm. However, the life of friendly college student Saki Morimi was altered forever during her graduation trip to America three months later. Akira Takizawa, a cheerful but peculiar man suffering from amnesia and convinced he is a terrorist, comes to her rescue in a state of full nudity. The oddity doesn't stop there, as Takizawa possesses a mysterious cell phone loaded with 8.2 billion yen in digital currency. Despite suspicions surrounding Takizawa's true motives, Saki develops a close relationship with the enigmatic stranger. Unbeknownst to her, this marks the start of a thrilling death game involving money, cell phones, and the fate of the world. As Saki tries to unravel the mysteries of her savior, Takizawa finds himself battling other individuals who also wield peculiar cell phones and regaining his memories that may tie him to the events of Careless Monday from months ago. "Higashi no Eden" chronicles their tribulations.