Busou Shinki - The slice-of-life battle story is set in a future that has neither World War III nor an alien invasion—just an ordinary future set after our current age. In this world, robots are part of everyday life, and they contribute in various aspects of society. "Shinki" are 15-centimeter-tall (about 6-inch-tall) cute partners made to assist humans. Equipped with intelligence and emotions, they devote themselves to serving their "Masters." These Shinki can even be equipped with weapons and armor to fight each other. Such Shinki are named "Busou Shinki" (literally, "armed divine princesses"). In particular, the Shinki Ann (Arnval), Aines (Altines), and Lene (Altlene) serve a high school freshman named Masato. Things change when a new Shinki, the bellicose Strarf, joins them. 武装神姫 - 「武装神姫」と呼ばれる小型ロボット（通称・神姫）が人間のパートナーとして認知され、様々な分野で利用される世界。 海外から帰国したばかりの少年・理人も、3体の神姫・「アン」・「アイネス」・「レーネ」を保有していた。父親から新たに送られた神姫・「ストラーフ」（ヒナ）や新しい街で様々な神姫と出会いつつ、理人と神姫達は毎日を楽しく過ごす。
