An ordinary high school student receives an intriguing app from a captivating succubus who appears unexpectedly in his life. The application, called Hypnos, holds the power to subtly influence those around him in profound ways. Curious about its effects, he decides to test it first on his lively gyaru classmate Fujimiya as well as the stern leader of the school's disciplinary committee, Akizuki Sakuranoi. Soon, both girls begin to exhibit remarkably compliant behaviors toward him, marking the beginning of an unexpected journey at school.