Asahi Shimbun Publications will release "Survival in Extreme Heat," the latest installment in the "Science Manga Survival" series, which has surpassed 15.5 million copies in total circulation, on June 30, 2026. This time, the theme is the "extreme heat" of summer, which is becoming more severe each year. Geo and his friends, who are hit by extreme heat that even triggers "Heatstroke Special Alert," encounter various troubles at an aquarium, a fish farm, and a vegetable field. As you read the story, you can learn about the causes and countermeasures for extreme heat, as well as what you can do in your daily life to prevent global warming. The first-edition limited bonus is a vinyl sword that inflates with air, "Survival! Air Sword." It is the largest bonus in the history of the Survival series and is perfect for use at the beach or pool. Extreme Heat Days Are About 4 Times More Frequent Than 90 Years Ago The Japan Meteorological Agency defines an "extreme heat day" as a day when the maximum temperature reaches 35 degrees Celsius or higher. The annual number of extreme heat days at 13 locations nationwide is increasing, and the average annual number over the last 30 years (1996-2025) has increased by about 4.2 times compared to the first 30 years of the statistical period (1910-1939), with an average of about 3.2 days. Why does extreme heat occur? "Survival in Extreme Heat" delves into the mysteries and threats of such abnormal weather. Mass Fish Deaths, Coral Bleaching - Extreme Heat Changes the Earth One day, as extreme heat continues and an alert is issued, Geo and Kei are asked by Dr. No to go to an aquarium near the sea. "Maybe it'll be a little cooler," Geo and the others hoped, but it was just as muggy as in the city! Extreme heat also has various impacts on the ecosystems of the Earth where we live. At the fish farm Geo and his friends visited, fish died in large numbers, and bleached coral reefs spread in the sea. Furthermore, in a village near the coast, vil