S1, E4: Yokosuka is now under attack by the fast battleships Kirishima and Haruna. I-401 sets sail to intercept them within the defensive barrier, using every trick in their strategic arsenal to evade the raw firepower of the two battleships. Sensing the changes humans have wrought on I-401's tactics, Kirishima and Haruna decide to take her out with an all-out attack, but Gunzou still has a trump car...