After passing away, a Japanese office worker finds himself reincarnated in another world as Ars, the newborn son of the noble Louvent family. The Summerforth Empire, where the Louvents rule over a small territory of a few thousand people, is a medieval-like land plagued by social inequality and political instability. As Ars grows older and learns more and more about his new environment, he becomes convinced that war will soon erupt. Fortunately, though Ars was not blessed with unrivaled strength or extraordinary magical aptitude, he does possess Appraisal: a seemingly unique skill that allows him to instantly grasp someone's current abilities and latent talents merely by looking at them. In an effort to prepare his domain for the imminent strife, Ars resolves to enlist the most exceptional people he can find, paying no attention to superficial qualities like race or social status.

A college student, Sendō Kazuki, happened to set foot in the doujinshi community. There, people are producing and selling doujinshi, which is the comic book drawn by fans rather than professional writers. At first he was reluctant, but as he met the girls earnest about producing doujinshi, he was gradually involved in creating it himself. This series is based on a Dreamcast/PC game, "Comic Party", and its setting is different from the TV series. The main characters, Kazuki, Taishi, and Mizuki are college students whereas they were high school students in the TV series. The story starts after Kazuki has become acquainted with other characters.

Takumi, a gifted chef, was just let go from his job. He lands a gig at an old boarding house called Astro-sou but hesitates to accept after learning he must also live there full-time. That is until he meets the beautiful and charming caretaker, Mira, and he is sold. The two begin to work together, and their connection deepens. But Mira has a secret: she is not from this world!

With the introduction of Hybrid Performance Exceed Reactor (HyPER)—a technology that injects new life into racing—race cars can now reach incredible speeds of up to five hundred kilometers per hour. Five years after the inception of the NEX Race, a competition where the cars are enhanced by HyPER and even AI, one man stands as the undisputed champion. Having won every title since the inaugural NEX Race season, Lorenzo M. Salvatore is the king of the racing world. Unexpectedly entering the tournament is a former ballet dancer, Rin Rindou, who has been given a chance to become a real racer after setting a world record in a racing video game. Forced to give up dancing, Rin shifts her focus to chasing a new goal, despite her lack of experience. Making the most of her peculiar skill set and the NEX Race innovations, the young newcomer may just be the one to dethrone the absolute king.