A part-time high school in Shinjuku, Tokyo. Students with all sorts of circumstances attend the school. Yanagida Gakuto (21 years old) is a delinquent who can't escape a negative spiral. Koshikawa Angela (43 years old), whose mother is Filipino and father is Japanese, has almost given up on keeping up with her classes. Natori Kasumi (16 years old) has orthostatic intolerance and continues to attend school in the nurse's office. Nagamine Shozo (76 years old) was unable to attend high school as a young man and had no choice but to work. Adapted from the novel "Sora Wataru Kyoshitsu" (宙わたる教室) by Iyohara Shin (イヨハラ シン).