The extra roundness and scrunchiness in the way the crying girl's face is being drawn, the toothy expressions and the subtle and efficient three dimensionality to her hair and head animation when she gets angry, are all dead ringers for Arai around this time. She looks like she almost came right out out of the Sazan Eyes OVA series he was Sakkan and CD for. Nachi's run at the end seems right in line with his style around the time as well, though maybe Oshima corrected the faces of Nachi and Assembler.