Sig Watanabe is a highly disciplined and serious military officer from the Tokino Empire, a nation with a culture inspired by traditional Japan.As part of the alliance between his homeland and the European-inspired kingdom of Avenir, Sig travels abroad to study modern military tactics and military science.While adjusting to life in a foreign country, he becomes involved with a petite young woman. Their contrasting appearances, personalities, and backgrounds create opportunities for sweet romantic moments and humorous situations.