Classroom Crisis

Humanity has expanded across the Solar System, settling colonies on every planet, with ambitions to push even further. Life in these colonies is peaceful, including for the high school students living in 4th Tokyo on Mars. Among them are Iris Shirazaki and Mizuki Sera. Iris is in her final year of school, training to become a test pilot, while Mizuki works as a mechanic on the same aircraft. Iris’s older brother, Kaito, serves as their homeroom teacher and oversees their program.