Agano (阿賀野) was the lead ship of her class of four light cruisers built for the Imperial Japanese Navy (IJN) during World War II. Completed in 1942, she escorted a troop convoy to New Guinea in December. In early 1943 the ship participated in Operation Ke, the evacuation of Japanese troops from Guadalcanal. Six months later Agano transported troops and supplies to New Guinea and she played a minor role in the Battle of Empress Augusta Bay in early November. A few weeks later, the ship was badly damaged by American airstrikes and she sailed for Truk under her own power the following day. While en route, Agano was torpedoed by an American submarine and had to be towed to her destination. After several months of repairs, she left for Japan, but was intercepted and sunk by another American submarine in February 1944. Most of her crew was rescued by her escorting destroyer, but that ship was sunk with the loss of most of her crew and all of Agano's survivors by an American airstrike the following day.
Agano has long black hair and light green eyes. She and her sisters wear a sleeveless serafuku that exposes her midriff with a red pleated skirt, which vaguely implies the sort of miko outfits that the battleships wear. She wears a necktie, gloves, belt, and has asymmetrical legwear where the left leg has a single thighhigh stocking on a garter strap.
- Agano has an exuberant, teasing, and playful personality. She shows her emotions plainly, and frequently gets carried away in what she is doing to the point of forgetting the time, even when she's supposed to be the timekeeper. Like many lead ships of a class in KanColle, she seems to have a special relationship with the second ship in her class, in this case, Agano has several references in her speech in the game to a tendency to grope or otherwise harass her sister Noshiro.
- Agano's catchphrase is "Kirarin".