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Akihabara@DEEP. It is an enterprise that is small but elite and organized by the legendary otaku of Akihabara. Soon, they'll be dragged into the struggle for supremacy in a world of information technology. A battle is about to begin in the Akihabara district for the future of the industry.

After its first story, From Eroica With Love completely shifts in focus from typical shōnen-ai to oddball comedy and Cold War era action. Dorian Red Gloria, a flamboyant English earl also known as the art thief Eroica, crosses paths with Major Klaus Heinz von dem Eberbach, a conservative German NATO intelligence officer. It's love-hate at first sight. After their first chance meeting, Klaus just can't seem to shake the thief—they run into each other all over the world, whether accidentally or by Eroica's machinations, and Eroica and his gang often end up helping or hindering missions being run by the Major and his agents. Soviet spies, British intelligence officers, and an Arab oil prince also make appearances.

15 years ago, a set of twins - girl and a boy - was born to the king of Linevan. Shortly after their birth, a prophecy foretold that when the girl turned 16, she would bring about the end of humanity. To avoid this fate, the king ordered the princess disposed of. She miraculously survived, and now she has turned 15.

Kazuma, an Alter who uses his powers for mercenary work and the occasional heist, keeps himself out of the spotlight, providing for himself and his ward, Kanami, in the wastelands of the Lost Grounds, away from the fledgling cities that have begun to sprout from the ruins of the former Yokohama. But when he crosses paths with one of the most fervent officers of HOLY, Ryohu - an Alter himself who has decided to help bring other Alters into HOLY under the auspices of order and justice - Kazuma becomes enraged with the organization's self-righteous attitude. He has no love for Alters that sadistically abuse their powers, but he also feels that HOLY has overstepped its authority. As he witnesses greater abuses by this special police force - not the least of which include the execution of a little girl who is discovered to have Alter abilities and the rampage of a renegade HOLY officer named George Tatsunami who has decided to take the law into his own hands - Kazuma becomes consumed with stopping HOLY. Alter-User Kazuma Torizuna may be the only one able to defy HOLY in search of the truth.