Trying on a coveted space suit. However, it was too big for Asumi and it was ridiculous. She began training to swim in a flight suit. Asumi, who was drowning in the river when she was young, was afraid of the water, but she swam alone after school to keep up with her weaknesses. Perhaps due to overreacting, Asumi suddenly sinks into the pool. I jumped for help... On the other hand, the custom-made spacesuit was a problem among the teachers.