Penguin Highway

Fourth-grader Aoyama carries himself with an unusually adult level of intelligence, a trait that earns him as much teasing from classmates as it does curiosity about the world around him. He’s also quietly taken with a friendly woman he meets at a dental clinic—someone who, to his surprise, becomes an unexpected partner in his latest obsession.

One morning, penguins begin appearing throughout his neighborhood with no clear explanation for how they arrived. Determined to uncover the truth, Aoyama throws himself into investigating the phenomenon alongside the woman, and their search leads to an even stranger discovery: a floating sphere they call “The Sea.” Anything that enters it never returns, and the penguins seem to be the only force capable of destroying it—though their involvement brings unsettling consequences.