Public Safety agents visit the SV2 and ask for help on a case. Itchoku Inubashiri, an ex-military Labor pilot turned terrorist of the militant anti-Babylon project group "Home of the Sea", has injured one of their agents, stolen his gun, and hijacked a taxi to Sakata. They tell Captain Gotoh that he is going to hijack the Soviet Attack Labor L99, code named Doshka, that will be secretly docking on a boat in Sakata en route back to Russia. Home of the Sea want to steal it to further their cause...