After a night of indulging in alcohol with his college department, Asahi ended up in an uncomfortable situation. Toono-sensei extended an invitation to him, only to reveal that he was about to have a sexual experience with Tsukasa, an omega in heat. Being an alpha, Asahi found it difficult to control his instinctual urges, but he was unaware that sensei recorded the whole act. As a result, he found himself trapped in an odd predicament with no way out.
Bonus: A single chapter tale entitled "The Clumsy Bride".