Battleship Girl SP Itsu no Hi ka

is the special volume of the Battleship Girl light novel series, written by Tsumugu Hashimoto and Illustrated by Yasuyuki Syuri. It was released under the Dengeki Bunko Imprint in February 2002.

Synopsis
"Battleship Girl SP" presented by Tsumugu Hashimoto & Yasuyuki Tamashii's golden combination is finally here! In addition to the two comics that were very popular with "Dengeki hp", three short stories including two newly written novels are included. In the short story, there are plenty of stories that fans can't miss, such as the story of the encounter between Momiji and Kaede, "Girls of Ardiles," Azumi's bittersweet first love story, "The Fool's Happiness," and Natsumi's junior high school episode, "One Day." ..

(source: Amazon JP - Translated)