日本語が話せないロシア人美少女転入生が頼れるのは、多言語マスターの俺1人

In the second year of high school, Iori Kagami is a boy who doesn’t stand out. Some of the students dislike him because of their impression of his twin sister, Shiori, who is famous as the perfect idol of their whole grade.

With special permission, Iori lives in a US military base in Japan and works part-time as an interpreter. While working with Christina, Iori’s high specs are revealed and he starts to look around at the people around him.

This is a story about how Iori’s specs are revealed when he gets involved with Christina.