Maware! Shirakawa-san: Boku wa Joushi ni Koi wo Suru

Shirakawa-san is a tomboyish, hard-working, handsome girl. She is admired by the female employees and highly regarded by the male employees. But what about Sakashita-kun, the new employee who ends up working under Shirakawa-san? She's more handsome than any man! Super office lady Shirakawa-san is great at both work and love (?)! (Source: Shueisha, translated) Note: Includes one extra chapter.