While preparing for the cultural festival, Ganta Nakami, dozing off in the corner of the classroom, is asked by a girl in his class to go to the observatory to pick up some cardboard boxes. The observatory is rumored to be haunted by the spirits of the former members of the Astronomy Club. The observatory is now being used as a storeroom, and Ganta finds a girl sleeping in a locker. The girl is Ganta's classmate Isaki Magari. After their enco...

Ganta and Isaki have been spending sleepless nights alone for a long time and have been troubled. Isaki proposes that they start an "Evening Fun Association” in order for them to have fun at night from now on. In the observatory that has become their secret place, a sofa that had been put out in the hallway as oversize trash and each other's personal belongings are brought in. Then a stray cat wanders into the observatory, goes straight to sl...

Ganta and Isaki's renovation of the observatory, which they have done without permission, is discovered by Miss Kurashiki, the infirmary doctor. She heeds their wish not to lose this place and allows them to join the Astronomy Club. In order to establish a track record as a club, the duo decide to go and meet Yui Shiromaru, an alumnus who has won the first prize in an astrophotography contest. Shiromaru, who works at a video game arcade that ...

The Astronomy Club decides to hold an observing party for the Perseid meteor shower in August. While Isaki is making posters to advertise the event and Ganta is organizing pictures and notes, Isaki finds the site of the fireworks festival in the picture data on Ganta's computer. Maruta invites Isaki to go watch the fireworks for "practice" while Isaki watches him. At the fireworks festival, there is a legend that if you do a certain thing wit...

It is forecasted that the sky will be cloudy throughout the summer camp. With the teachers watching him, it seems unlikely that Ganta will be able to take pictures at night. Isaki promises Ganta that if the night is clear, they will meet on the beach under the stars. When the summer camp begins, Ganta is the only one who cannot sleep in the tent where he stays with his classmates, and he becomes restless. On the second night, Ganta suddenly n...

Ganta's picture of the starry sky taken at the summer camp did not capture the surface of the water well, so he decides not to submit it in the contest. As a revenge, he comes up with the idea of going to a training camp this time. Before discussing where to go, Isaki looks at the picture of herself taken by Ganta and smiles shyly. They make a list of potential places and plan their activities, and the anticipation for the camp grows between ...

It is the day of the fireworks festival. Ganta, Isaki, Kanigawa, Anamizu, Nono and the others are working hard handing out pamphlets for the observation party. When the sun is setting, Ganta is given a push by Ukegawa and sets off to fulfill his promise to Isaki to go see the fireworks. Isaki, dressed in a yukata, is waiting for him. They head for the rooftop of the school where they have decided to watch the fireworks together. They walk thr...

Before the summer break starts, the student council give the go-ahead for the observation party plan. With the help of Ukegawa, Kanikawa, and the others, preparations are steadily underway, and more than 50 people have signed up to participate, so all that remains is to wait for the day of the event. Ganta's childhood friend Ukegawa recounts a memory of Ganta from his elementary school days. Ganta, who had always been fast on his feet, sudden...

"Since the observation party is called off, Ganta has to take some special pictures at the training camp that will be good enough to be selected for the contest. While he is determined to do so, he does not receive club funds for the camp from the student council, so he has no choice but to look for a part-time job. Ganta goes to the job interview in the ""go for broke"" spirit, but he does not get the job...

Although Ganta has started working part-time, it still cannot cover the budget for the training camp, but using Isaki's grandmother's house as a base seems to solve that problem. Isaki's sister, Haya, will accompany them as a chaperone, and the Astronomy Club is off to the summer training camp. Before departing, Ganta receives advice on photography from Shiromaru. Shiromaru looks at Ganta's photos and is impressed with how much he has improved...

On the second day of the camp, Ganta and Isaki's journey begins on Mitsuke Island. Pitching their tents at the campsite, the two go around in the light of day to look for a photo shooting point. They wait for sunset to start shooting, but are told that Mitsuke Island is lit up at night during the summer vacation period. They decide to go closer to Mitsuke Island until 23:00, when the lights are turned off...

Ganta and Isaki are alone at Isaki's grandmother's house because Haya, who was supposed to be their chaperone, is gone. They can't go out to shoot on a day when it rains from morning, and they cannot go shopping even though they are running out of food. They are in a tight spot, but are also having a good time, organizing photos on the computer, doing homework for the summer vacation, and going to close the storm shutters in the rain...

"With Magari around, I feel like going to school now. I wonder what kind of relationship this is?"A high school student, Ganta Nakami, who suffers from insomnia, meets Isaki Magari, who also suffers from insomnia, in an astronomical observatory, which is used as a storeroom now, when he's trying to skip helping out to prepare for the school's cultural festival. Thus, the two end up sharing a secret place...?"Surely your sleepless nights must ...