Miru admires her senior Yamamoto. But Yamamoto is in love and living with Miki, who shares the same department with both of them. Not giving up, Miru is determined to come up with a plan to win over the person of her dreams. She often wears a long dress, using the excuse of not knowing how to report, Miru asks Yamamoto to teach her. Miru constantly sticks close to Yamamoto, even sitting on him, holding his cock straight into her pussy right in the middle of the office! At first glance, it seems like Miru is focused on getting help from Yamamoto, but in reality, the two are secretly fucking! However, Yamamoto still has feelings for Miki and doesn't want to break up with her. Seeing this, Miru becomes even more aggressive, trying to seduce him even more. The excitement, stimulation, and pleasure that Miru brings have conquered Yamamoto. He agrees to break up with Miki and become her boyfriend...