Two OVA episodes are bundled as DVDs with each of volumes 6 and 7 of the manga. The first OVA is a prequel story written by the manga's author. Before the beginning of the main story, Rea and Chihiro have already met at a certain place: an outdoor hot-spring bath. The second OVA takes place after the series (effectively episode 14). The Furuya family finds a mysterious young girl hiding under the household temple.

No dream is too big for Appare Sorrano, a socially-awkward inventor living in a small rural town in Japan in the late 19th century. Fascinated since childhood by the creation of steamships that can connect people across great distances, he's learned to make machines of all kinds from various scientific texts. His goal is to sail across the sea, beyond the sky, and ultimately, to the other side of the moon. Unfortunately, through a string of events, Appare finds himself stranded in the middle of the sea on his mini steamship. Floating alongside him is a skilled but cowardly samurai, Kosame Ishikki, who was tasked to keep his eccentric behavior in check. Just when all hope seems lost, a large steamship saves them and takes them to Los Angeles. With no money or plans, they decide to participate in the "Trans-America Wild Race," which gives Appare the chance to build his own automobile, and Kosame the opportunity to use the cash prize to return home. However, against rival racers and unknown challenges residing in the wilderness, just how far will this adventure take Appare and Kosame? [Written by MAL Rewrite]

Unbeknownst to most humans, a bizarre tournament is held to decide the next ruler of the Heavenly World. In this tournament, 100 Heavenly Beings known as the "God Candidates" are required to search among the middle school students on Earth, and transfer their powers to a student of their choice. The chosen ones will then battle each other, representing their God Candidates. The victor of this tournament will be awarded the "Blank Talent"—allowing them to choose any one unique ability they so desire—while the God Candidate they represent will obtain the position of "God" and become the king of the Heavenly World. Participating in this grand tournament is Kousuke Ueki, a middle school student who is given the power to turn trash into trees by his homeroom teacher, Kobayashi. Despite the concerns of his classmate, Ai Mori, Ueki embarks on a journey to pursue his own sense of justice after witnessing the people around him misusing their powers for selfish purposes. But as he encounters talented power users such as Seiichirou Sano, Rinko Jerrard, Robert Haydn, and Hideyoshi Soya, he realizes that achieving his goal might be harder than it seems. [Written by MAL Rewrite]

Chika Homura begins her high school career with a goal: to develop a "cute girl" persona. After quitting the volleyball team despite her all-star status, Chika decides to join her school's underrated Wind Instrument Club and play the flute, believing it to be the most delicate and feminine instrument. For the first time in nine years, Chika reunites with her childhood friend and total opposite, Haruta Kamijou. Unfortunately for Chika, Haruta is not fooled by her efforts to become more endearing. But this does not deter Chika, and she develops a crush on the band instructor, Shinjirou Kusakabe—but so does Haruta! However, Chika's high school life just won't go according to plan, as mysteries begin appearing around her and her friends. The club members must work together to solve the mysteries plaguing the school, all while trying to find more members to compete in musical competitions. [Written by MAL Rewrite]