The first season of Corpse Princess, titled: Aka with 13 episodes, revolves around Makina, a Shikabane with a mission to kill other Shikabanes and avenge her family's death.
The first season, Aka (, Red), aired on October 2, 2008 on AT-X and finished on December 25, 2008. 13 Makina Hoshimura, a deceased teenager reanimated as a Shikabane Hime under control of a secretive sect of Buddhist Monks, is introduced as she continues her mission to eliminate other undead Shikabane on Earth using her fists, feet or dual-wielded MAC-10 sub-machine pistols. Her target is Hagino, a charismatic psychopath with a penchant for serial-killing women, who rose from the dead as a Shikabane. The world of local high school student and orphan Ouri Kagami is shaken when he encounters Makina after she is knocked out during an early encounter with the monstrous Hagino. Unbeknownst to Ouri, his older brother-figure, Keisei Tagami, is somehow involved with Makina as well. Keisei dispatches Makina to destroy a J-pop singer named Kun Osaki, rumored to have become a Shikabane after refusing to accept her death without having a concert. However, the job is made more difficult because Osaki has ties to organized yakuza mobsters, who interfered with the first assassination attempt after being tipped off by a mysterious monk. Ouri, digging for information regarding a fire that had killed Makina and her family in the past, is led to her tombstone in the Hakuji Temple. After he finds Makina there, she explains that Osaki is her next target, which urges him to help her no matter what. The two go back to find Osaki, who then turns into a Shikabane. Keisei arrives and explains to Ouri the relationship between Shikabane Hime and Contracted Monks. While playing a soundtrack from Osaki's album cover, Keisei gives Makina a hand in destroying Osaki. The Kogon Sect discover from surveillance videos the Seven Stars are in the area, led by Hokuto. As Rika assigns Keisei to pursue the Seven Stars, this gives Makina the resolve to finally have her vengeance against them. Ouri returns to living at the orphanage for the time being since he is unemployed, and Keishi reveals more about his bond with Makina. He had been raised by Makina's parents as a child before moving into the orphanage owned by Riko when he got older. However, after the Seven Stars burned Makina's family alive, he eventually agreed to make a pact to be Makina's Contracted Monk for her to avenge her family. Meanwhile, the plan to destroy the Kogon Sect advances when Ena makes his move and possesses Ouri. Kowaku and Akasha attack Makina and Keisei at the temple grounds. As Akasha retreats after revealing that this frontal assault was a ruse, Keisei goes in hot pursuit and Makina is left at the temple grounds to engage Kowaku. While checking on the safety of the orphans, Keisei is stabbed by the possessed Ouri. 
The Kogon Sect discover from surveillance videos the Seven Stars are in the area, led by Hokuto. As Rika assigns Keisei to pursue the Seven Stars, this gives Makina the resolve to finally have her vengeance against them. Ouri returns to living at the orphanage for the time being since he is unemployed, and Keishi reveals more about his bond with Makina. He had been raised by Makina's parents as a child before moving into the orphanage owned by Riko when he got older. However, after the Seven Stars burned Makina's family alive, he eventually agreed to make a pact to be Makina's Contracted Monk for her to avenge her family. Meanwhile, the plan to destroy the Kogon Sect advances when Ena makes his move and possesses Ouri. Kowaku and Akasha attack Makina and Keisei at the temple grounds. As Akasha retreats after revealing that this frontal assault was a ruse, Keisei goes in hot pursuit and Makina is left at the temple grounds to engage Kowaku. While checking on the safety of the orphans, Keisei is stabbed by the possessed Ouri. 
