Schoolboy Aoyama is bright, inquisitive and a bit headstrong. He has a lot of brainwork to get busy with – after all, he'll be an adult in just a few thousand days. For the moment, though, he'll have to live life as a fourth-grader. Not that it's a bad life. Summer has arrived and school's nearly out. He has a crush on an intriguing older woman he's met at his dentist's office, who's coaching him in his chess game. And a colony of penguins has materialized in the middle of Aoyama's sleepy little town. Where on Earth – or elsewhere – did these waddling interlopers come from? Aoyama and his friends embark on a research mission, applying rigorous scientific methods and principles. Their discoveries, however, only lead to ever more puzzling wonders... 在这个原本百无聊赖的平凡夏天,一群企鹅凭空出现在没有海的住宅区又凭空消失.在目睹了牙医助手姐姐所投掷的可乐罐变成企鹅之后,有着强烈好奇心的小少年“青山君”决心一探究竟,因而展开了一场不可思议而令人难忘的夏季冒险. Aoyama ialah seorang pemuda yang ceria, bersikap ingin tahu dan sedikit keras kepala. Musim panas sudah sampai dan sekolah hampir tamat. Seorang gadis lebih sulung yang dia bertemu di klinik doktor pergigiannya telah menarik minatnya. Sebuah koloni penguin menjelma di tengah-tengah pekan Aoyama yang bosan. Dari mana mereka datang sebenarnya? Aoyama dan kawannya bermula misi kajian, mengamal kaedah dan prinsip sains yang ketat. Namun, pencarian mereka hanya menimbul lebih banyak soalan…