Set in the same universe as the live-action series. This work will explore new elements of the story mythology.

Ever since she was young, Komichi Akebi has always adored sailor uniforms, even going so far as to ask her mother to sew one if she succeeds in getting into her mother's alma mater, Roubai Academy. And thus, when she gets accepted into the prestigious school, Komichi is ecstatic. However, much to her surprise, the middle school no longer uses sailor uniforms as its dress code—making Komichi stand out from her schoolmates. Despite this, Komichi is granted permission to continue wearing the traditional attire. With renewed confidence, Komichi meets fascinating classmates as they experience school life together. Under the colorful shower of blossoming prospects, an exciting tomorrow awaits them!

Siblings Aki and Sora Aoi have been in a secret relationship ever since they confessed their feelings to each other on a rainy day. Sora's twin sister Nami—unaware that his affections lie elsewhere—decides to have him join the Fashion Research Club at school in an attempt to set him up with their classmate, Kana Sumiya. However, Nami's actions mask painful truths. While her motives appear like those of a good sister trying to help her brother finally get a girlfriend, she is harboring secret, forbidden feelings of her own.

The war between the Terrans and the Vers Empire of Mars has ended, allowing humanity to blissfully enjoy their lives in a time of peace. Nineteen months later, however, the Vers princess makes a shocking public declaration: the Terrans are a foolish race that covets resources, destroys nature, and are devoted to the pursuit of pleasure. And so, to protect their precious Earth, she calls upon her knights to take up arms, and the raging battle between the two civilizations reignites. Slaine Troyard has found a place among the Martians, giving Earth a short respite from the war against the Vers Empire. However, a peaceful resolution seems inconceivable. The various people who fought desperately for survival in the past now find themselves in the midst of yet another bloody and chaotic conflict, one that will forever alter the fate of humankind.