Саґара Йошіхару

A modern-day teenager who finds himself in an alternative version of the Sengoku period where some of the famous warlords of the era are female. Using his knowledge from the video game, Nobunaga's Ambition, Sagara helps Nobuna in her quest to unite and conquer Japan. Also goes by the nickname "Monkey" much to his chagrin. He also finds himself being kicked around by Nobuna especially when he say or does something that irritates her or when she simply feels like it.

(Source: Wikipedia)