Miru likes his senior Yamamoto. But Yamamoto is in love and living with Miki, who shares the same fate as the two. Not giving up, Miru determined to come up with a plan to win back the person of her dreams. She often wears a long dress, using the excuse that she doesn't know how to make a report, so Miru immediately asks Yamamoto to teach her. Miru continuously stuck close to Yamamoto's body, she even sat on top of him, holding his cock and shoving it straight into her pussy right in the middle of the office! At first glance, it seemed like Miru was attentively asking Yamamoto for instructions, but in reality the two were secretly fucking each other! However, Yamamoto still has feelings for Miki, he does not want to break up with her. Seeing that, Miru stepped forward even more, she tried to seduce him even more. The feeling of thrill, excitement, and joy that Miru brought conquered Yamamoto. He agrees to break up with Miki and become her boyfriend...