Embarrassed to be the only member of the Electric Brain Study Society who doesn’t own a computer, Akira Takaoka is thrilled when an electronics store advertises a PC9821 for only ninety-eight thousand yen. The deal is limited to the first five customers; unfortunately, by the time Akira gets there, the PCs are sold out. However, a mysterious man in the back alley offers him the exact same deal. Akira takes the deal, only to realize that this PC is not a 9821 version, but a 2198 version instead. It turns out that the PC2198 is an advanced bio-type computer that needs a nearly constant input of sperm to function! The PC2198, named Mimi, now has to defend Akira from the evil Apple Nacintosh sisters who want to take over the entire Japanese PC market. Will the embarrassed Akira be able to supply Mimi with what she needs to win?

In 2099, Earth has shifted off its axis and begins to rotate at an angle of 90% to the 20th-century equator. Three years of natural disasters follows, and when things settle down, Earth's ten billion population has died and only two million moon colonists remain. Some return to begin the repopulation of the world in seven new cities and the remaining colonists of the moon fear that their former neighbors might pose a threat and construct a ring of defensive satellites to trap them on the newly repopulated homeworld.

Daigo Asahina is Medaka Gumi #2's/Me Gumi's new rookie firefighter, and already he's done crazy things, like throwing people off of a rooftop to save them from an explosion. He had good intentions, but his deeds are starting to hurt the company's reputation. At Sengoku City's Concert Hall, a fire breaks, and the some Emergency Rescue Squad needs rescuing. Daigo will do all he can to keep his promise: Not to let anyone die on the job.

Machiko Mai is the newest teacher at Asama Elementary; she's young, beautiful, and has the perfect proportions—traits that attract the attention of not only her students, but the rest of the perverted faculty as well. Whether it's luring her in and spraying up her skirt with a hose or leaps and bounds to grab her breasts, there's nothing that Machiko's first year students won't try to do. Regardless of her embarrassing plight, Machiko is always a good sport and tries her best to help out her students—at any cost to her dignity!