Arpeggio of Blue Steel -Ars Nova-

Hyuga stays behind deflecting the attacks of Kongou's fleet to buy time for Iona and the others to escape. Before leaving Iwo Jima, Gunzou asks for Takao's help and she agrees to join his side. Unwilling to listen to Hyuga's words, Kongou fires her Super Gravity Cannon at her but fails to destroy her and orders Maya to fire her own cannon at the exhausted Hyuga but Takao appears in the nick of time to block Maya's shot. Believing that Hyuga and Takao are just covering the I-401's escape, Kongou tracks her down and gives chase, refusing to slow down even after passing through a minefield. Iona tries to reason with Kongou with no success and when the battleship attempts to fire her Super Gravity Cannon underwater to sink her, Hyuga takes advantage of Kongou's distraction to hack into her systems and have her lose control to buy enough time for Iona and Gunzou to escape. Takao then reveals to Kongou that instead of Takao, the true decoy was Iona herself, while the vibration warhead, Makie, Haruna, Kirishima and the rest of the I-401's crew were safely hidden aboard her and she returns to pick up Hyuga to rendezvous with Iona and Gunzou, who despite escaping from Kongou's grasp, are later ambushed and sunk by I-400 and I-402. (Source: Wikipedia)