Mitsuha, who is about to take the entrance exam, finds herself in the mud. - It's not like we're in the rain or melting snow. - My mind and body were stuck in the mud called sexual desire. - One day, Mitsuha falls in love with a man who comes to her home as a tutor. - In a private lesson with just the two of them, the man's rationality is destroyed by the whispers of the literature girl, and his semen is squeezed out without any resistance. - They fall into a master-servant relationship of bookworms. - Their relationship should not be exposed to anyone, and the only sound in the quiet room was the sound of their genitals mixing together.