Hidden away on a remote mountaintop, the Kokoro Library struggles to attract many visitors. Nevertheless, it is the home of sisters Iina, Aruto, and Kokoro, who consider it their mission to keep the library running in their parents' stead. Kokoro has long dreamed of becoming a librarian at the library with the same name as her, and tries her best to keep up with her older sisters. Due to the lack of patrons, the girls mainly spend their time sipping tea, chatting, and reading. However, as the number of mysterious visitors progressively increases, Kokoro begins to learn about the strange history of Kokoro Library—a place where small miracles seem to blossom.

This episode takes place before the actual planning of the School Fair and shows how the girls spend their summer holidays.

Wang Ling, the major Protagonist of the anime, has enormous uncontrollable power wants to live a low-key life. He wants to get rid of these powers. Sometimes, he just hides his powers from other kids just to look normal. He avoids contact and connections with others just to hide his powers. But as time passed, it was getting way difficult to hide his powers. Even though he had some good friends who genuinely cared for him and he fell in love with Sun Rong eventually. Ling tries to save her in every possible way and often changes the reality in order to be with her. But when Wong gets to know this, she denies any help, and they get separated and start living in parallel worlds. They accept their fate, thus continue to live their lives.

The story focuses and revolves around the 108th Guard Squad, stationed in Aomori. A poorly equipped unit with very little military standing, it is often viewed as a 'reject camp' for pilots not making the grade for the elite units based in Hokkaido. The apparent helpless nature of this force is hardly a deterrent for the encroaching enemy armies, ever closing in on both the 108th and the rest of the empire. The young pilots of the 108th, who had dreamed on returning home, are plunged forcefully and unwillingly into a war.