Miko and Yoshio had a healthy relationship, but on their way home from a date, Saito took a photo of them kissing and handing over a condom. Saito used this to blackmail Miko into having sex with a condom. Eventually, Miko completely fell for it and began begging for raw sex. Despite this, she refuses to break up with Yoshio. While she claims to still love him, in reality, she just wants to indulge in the pleasure of immoral cheating. To her, Saito is merely a cock that makes her feel good.
