An animated spin-off from the Densha Otoko (Trainman) TV drama. In the drama, actor Itoh Atsushi plays the otaku Yamada, whose main love in life is the Mina anime, a cutesy busty heroine with floppy rabbit ears and carrots sticking out her rear. Mina itself is a character homage which triggers back to the Daicon Animation done by GAINAX where a similar nameless bunny girl appeared. Densha Otoko futher featured an opening with scenes which were appearing back in the Daicon Animation. (Source: AniDB)

Modern Germany is plagued by an outbreak of "Amalgams." Existing solely to wreak havoc, these cybernetic entities spawn from rotting flesh and can fuse with technology to gain new abilities. With society left in the wake of their destruction, the Xenogenesis Assault Team (XAT) is formed to suppress the threat. Alongside its primary mission to protect against the Amalgam attacks, the organization is also researching the newly discovered "amalgamated" humans which possess rational thought and are far deadlier than their non-sentient counterparts. Joseph Jobson is one such amalgamated human who has full control over his powers. Although successful in his line of work as a lone warrior, an unfortunate encounter with the recently-turned-Amalgam Gerd Frentzen makes him a priority target of the XAT. As he eludes the organization and seeks new allies, Joseph is transformed into the Blassreiter—a being heralded as the strongest Amalgam in existence. Now, he must fight back with his newfound powers to uncover the truth behind not only his past, but also the entire Amalgam conflict.

As fifteen children at a summer camp enjoy their carefree vacation together, they stumble upon a small cave near the beach. The group finds a mysterious room deep within its caverns, where they meet a strange man who calls himself Kokopelli. The man invites the children to play a game that involves taking turns controlling a robot to protect the Earth against aliens. Thinking it might be an interesting computer game, all but one of the children sign a contract agreeing to play. Later that day, the giant robot appears in person and the children are teleported into its cockpit, where they find Kokopelli, who pilots a fight against a similar robotic creature that has appeared nearby. After winning the battle, Kokopelli tries to apologize but is interrupted as the children are teleported back to the ground in the midst of the carnage. As the bewilderment following the fight settles, the robot suddenly disappears and the children are left scared and confused. Despite seeming like a harmless game at first, the children never anticipated the stakes of this game and how their pasts would intertwine with their decisions going forward.