Sudou Kaname, an ordinary high school student, receives an invitation email to try a mysterious app called "Darwin's Game." Kaname, upon launching the app, is drawn into a game where players fight one another using superpowers called Sigils. Without knowing the reason for all this, can Kaname survive furious battles against the powerful players who attack him?
In a fateful childhood encounter, Mira Kinohata met a stargazing dreamer named Ao Manaka. Though their time together was short, Ao showed Mira the wonders of astronomy, from orbiting planets to distant stars. Before they parted, Mira learned that a star with her name exists, but there are none with Ao's. And so, she forged a promise: one day, she would discover a new asteroid and name it after Ao.
Years later, Mira is still fascinated with astronomy. Now in high school at Hoshizaki Academy, she tries to join the Astronomy Club. Unfortunately, she finds out that the club has been merged with the Geology Club to form a single Earth Sciences Club. She joins this new club and finds a pleasant surprise—she reunites with Ao after years of separation.
Alongside their new clubmates, Mira and Ao begin their journey together to fulfill their promise. How hard could it possibly be to find an asteroid?
The story follows the adventures of Chiya, a little boy who is curious about the world around him. He lives with his parents and has a magical cloth doll named Shirabi, who only comes to life when he is with him. He also has a friend named Zanburek, a bee who lives in their garden and joins him in his learning journey. Zanburek has other friends.Through this process, he discovers new things about himself and the world around him. The story covers various topics, such as the five senses, the seasons, geometric shapes, the size of objects, games, drawing, numbers, types of birds and plants, facing fears and recognizing dangerous objects, the importance of healthy eating, different flavors and tastes, the importance of order and cleanliness, the importance of exercise, the importance of reading and helping with housework, and more.