Blue Thermal

A high-school girl, Etsuko, just spends her days without any aims or purpose, until one day, Riina, a transfer student, asks her help to set up a boat club. Although Etsuko reluctantly accepts after hearing Riina speak passionately about her dream, she gradually starts to embrace the club after spending time with her teammates.

Ever since coming across the world of boy’s rhythmic gymnastics during the last summer of junior-high, Shotaro Futaba has become fascinated with the sport. So when he enters Soshokuan Private High School, known as Ao High for short, he heads to the boy’s rhythmic gymnastics club, where he meets unique seniors and the ace of the team, Ryoya Misato. The members of the club each have their own passions, but they’ve put it all on the line with a single goal in mind. Now the next stage in their journey has arrived: the inter-high competition!

In an alternate timeline, Japan was divided after losing World War II: Hokkaido was annexed by "Union" while Honshu and other southern islands were under US sovereignty. A gigantic yet mysterious tower was constructed at Hokkaido and could be seen clearly from Aomori (the northernmost prefecture of Honshu) across Tsugaru Strait. In the summer of 1996, three 9th-graders had made a promise that one day they'll build an aircraft and unravel the tower's mystery, but their project was abandoned after the girl, Sayuri Sawatari, began experiencing sleeping sickness and transferred to Tokyo for better treatment. Three years later, Hiroki Fujisawa accidentally found out that Sayuri had been in a coma since then, and he asked Takuya Shirakawa to help him finding a way to revive her. What they don't know yet is that Sayuri's unconsciousness is somehow linked with secrets of the tower and the world.

Yuna Ichihara's spring break is far from pleasant, especially after she sends off her best friend Sacchan, who is moving away. But while heading home, the timid girl brightens up when she encounters a boy who looks exactly like her first love—a prince from a shoujo manga. Subsequently, she finds herself in a peculiar situation with the mature Akari Yamamoto, a new neighbor who immediately befriends her. Now attending the same high school together, Yuna shows interest in Akari's brother Rio—the same mysterious and handsome boy she met during spring break. Likewise, Akari is falling for Yuna's carefree childhood friend, Kazuomi Inui. However, love is not at anyone's fingertips, as the relationship between these four contrasting friends faces complications, preventing them from moving forward. To discover the truth between them, they will need to confront their own struggles and uncover secrets hidden among themselves.