Hayabusa - sanada dengekichou manga

Hayabusa - Sanada Dengekichou summary:

From Shoujo-Sense: Sasuke Sarutobi is the commander of the Sanada army's elite force, Hayabusa. While Sasuke serves Yukimura with respect and love, within his squad he is known to be very strict and have an extreme S personality. As Sasuke twists their arms to make them stand up to it, Hayabusa members strive day after day to uphold their duty... Note: S = sadist