Fuyuki, who got married within the company and continued to work with her husband Ayumu even after marriage, was preparing for a pre-celebration with her colleagues because Ayumu's birthday was next week. Mitsunori, a colleague and also a friend of Ayumu, was particularly cooperative and invited Fuyuki to shoot a video letter. However, once they stayed in the office and started recording with a video camera, Mitsunori's attitude suddenly changed, forcing Fuyuki into a shameful position and inserting his penis deep inside her, ejaculating inside. And until Ayumu's birthday, Mitsunori continued to film the surprise internal ejaculation video...