Before Chise became the ultimate weapon, there was another—Lieutenant Mizuki. A battle-hardened military woman, she volunteered for an experimental procedure after injuries left her unable to return to the battlefield. As the prototype ultimate weapon, Lieutenant Mizuki was highly successful on the battlefield, however, as the first candidate, her development was limited. When a more suitable candidate to become the weapon, Chise, is forced into the military, Lieutenant Mizuki thinks that she is silly, weak, and unsuited for the role. As the only other person to have undergone the procedure, however, Lieutenant Mizuki can hear Chise's thoughts and is the only one who understands her. As the war rages on and Chise's development progresses, Lieutenant Mizuki discovers more about Chise, ultimate weapons, and herself.

Shuurei Kou and her friend Eigetsu To, a boy prodigy of humble origins, have been appointed co-governors of the Sa province, one of the eight provinces in Saiunkoku. Together, they decide to make the province an academic research center in the hopes of bringing a long overdue prosperity to the region. However, while Shuurei goes to the capital to obtain approvals for the ambitious project, the Sa province's recently established tranquility is threatened by a pandemic that brings both death and turmoil as it begins to spread among the people. Counting on Eigetsu to monitor the situation until her return, Shuurei seeks support from her allies to find a suitable treatment. Yet, Eigetsu's past personal conflicts distract him, providing an opportunity for opponents of Shuurei's position to take advantage of the troubles and undermine her authority. Becoming a government official has been Shuurei's lifelong dream, but it is no easy task for the first woman undertaking such a position. Will she step up and overcome this great challenge or give in to the looming adversities?

Shuurei Kou, the daughter of a noble yet impoverished family, is a clever young lady who dreams of becoming a government official and contributing toward her country. However, her dream is out of her reach as such a position is forbidden to women. While her father works a low wage job as an archivist at the palace, Shuurei has to juggle odd jobs to make ends meet. Then, one day, an unexpected visit changes her life. Shuurei is called to assist Ryuuki Shi, the new emperor who is known for slacking on his duties and preferring the company of men. Tempted by the generous compensation, she readily accepts the chance to become the young emperor's consort for six months. Luckily, she is not alone as Seiran Shi, her trusty friend, joins her as Ryuuki's bodyguard. While tasked with transforming the new emperor into a responsible ruler, court life and politics prove troublesome as Shuurei faces the challenges of her new life. Set in a fictional country, Saiunkoku Monogatari centers on the idea of meaningful leadership, its adversities and the rewards that come alongside a prospering nation.

Introverted classical pianist and top student Kaoru Nishimi has just arrived in Kyushu for his first year of high school. Having constantly moved from place to place since his childhood, he abandons all hope of fitting in, preparing himself for another lonely, meaningless year. That is, until he encounters the notorious delinquent Sentarou Kawabuchi. Sentarou's immeasurable love for jazz music inspires Kaoru to learn more about the genre, and as a result, he slowly starts to break out of his shell, making his very first friend. Kaoru begins playing the piano at after-school jazz sessions, located in the basement of fellow student Ritsuko Mukae's family-owned record shop. As he discovers the immense joy of using his musical talents to bring enjoyment to himself and others, Kaoru's summer might just crescendo into one that he will remember forever. Sakamichi no Apollon is a heartwarming story of friendship, music, and love that follows three unique individuals brought together by their mutual appreciation for jazz.