Not long after putting the previous supernatural incident behind them, the members of Yamaboshi Academy's Student Cultural Society (StuCS) must deal with Fuusenkazura's newest trial—emotion transmission. This phenomenon allows the club members to hear each others' true thoughts, but with one catch: the timing, sender, and recipient are all completely random. To make matters worse, the club's supervisor, Ryuuzen Gotou, may have to step down due to his responsibilities for the upcoming school year. With emotions running high and Valentine's Day around the corner, the seemingly close bonds of the StuCS will be tested when their true feelings for each other are laid bare.

In junior high, Ryou Mizushima and his friends join the badminton club on a whim. As he grows fond of the sport, Ryou works tirelessly to improve his badminton skills until he qualifies in the prefectural tournament. Lacking a coach who can bring out his full potential, he does not consider entering a high school with a strong badminton team. Instead, he plans on attending a local high school where he can play badminton for fun. However, Ryou's perspective changes when Yokohama Minato High School's badminton coach scouts him. Not only does the institution have one of the strongest badminton teams in the region, but it also has Kento Yusa, a player Ryou admires. Though hesitant at first, Ryou decides to enroll with the support of his sister. Possessing a firm ambition, he begins to gain experience with the proper guidance of a coach—all in hopes of surpassing Yusa one day.

Two planets, one to the East and another to the West, were once bound together by a chain called the Dragon Stream. But now, that chain is broken and the two halves are only joined in war. Nobunaga the Fool is heir to the Eastern Country of Owari. Regarded as too foolish and carefree by many, including his friends, Nobunaga is thought to be a nuisance even by his father. A girl from the West named Jeanne Kaguya d'Arc has visions of a "Savior-King." She is accompanied by Leonardo da Vinci as she journeys to the Eastern Planet in search of the person in her visions. Leonardo and Jeanne quickly fall victim to a military confrontation between powerful mecha, only to be saved by Nobunaga. Nobunaga takes control of Leonardo's mecha, intending to warn his family of the siege he suspects. Jeanne suspects that the lackadaisical Nobunaga might be the Savior-King she's envisioned.

Following the successful Sanyou campaign, the Qin army, including 1,000-Man Commander Li Xin, inches ever closer to fulfilling King Ying Zheng's dream of unifying China. With a major geographical foothold in the state of Wei now under its control, Qin sets its sights eastward toward the remaining warring states. Meanwhile Li Mu—an unparalleled strategist and the newly appointed prime minister of the state of Zhao—has taken advantage of Zhao's temporary truce with Qin to negotiate with the other states without interruption. Seemingly without warning, Ying Zheng receives news that armies from the states of Chu, Zhao, Wei, Han, Yan, and Qi have crossed into Qin territory. Realizing too late the purpose behind Li Mu's truce with Qin, Zheng quickly gathers his advisors to devise a plan to address the six-state coalition army on their doorstep. For the first time in history, the state of Qin faces complete destruction and must use every resource and strategy at their disposal to prevent themselves from being wiped off the map.