Yukako Yoneyama

Taking place in the year 1937 on the eve of World War II, the story involves a mysterious spy training organization known as the "D Agency." The organization is established by Lieutenant Colonel Yuuki from the Imperial Japanese Army. His ideals lead him to recruit people beyond military academy graduates and personnel, while training them to become skilled agents in arts of manipulation. These agents would become a specialized team to conduct operations. One such antihero agent, under the name Jirou Gamou, goes on a harrowing mission to uncover secret documents titled "Black Notes," while battling forces from within and without his own ranks.

Takashi's childhood friend Saya and his little sister Mika may not see him as a real man, but just being around them has been provoking him more and more. Following yet another failed proposal on his part, Saya feels bad for him and lets him grope her breasts, but it quickly gets out of hand and turns into a full night of full-blown sex! (These OVA's are based on the erotic manga by Goban.)