He's been dating Ibuki, a female college student, for eight months and they both work the same part-time job, and they're very much in love. One day, a senior from his club sends him a video on Ibuki's smartphone, which she's forgotten. When he secretly watches it, he sees her letting loose and revealing her lewd behavior at a party... He's confused, but he can't stop peeking at the videos that are sent day after day. He's filled with a mixture of anger and excitement as he sees her making lewd orgasm faces and begging for his sperm, which she never shows in front of him. "It feels better than my boyfriend's!" she says, and falls into wild sex...