A team of doctors will be dispatched to help injured soldiers isolated on the front lines. The 7th Squadron was entrusted with the escort, but in the fog, a shadow that looks like a mythical beast suddenly appears in front of the party on the mountain road. It was Estelle, a war orphan whose parents were killed by a phantom beast, who forcibly attacked there. Nagaoka, a doctor, worries about Esther, who sometimes acts daringly.