START-307 By Day, The New Female Announcer Koi Is A Pure And Innocent Girl, But By Night, She Helps Me Practice My Voice While I'm Working Overtime. She Whispers Extremely Vulgar And Pure Dirty Talk In My Ear, And Comforts Me With Her Gentle, Embracing Finger Techniques And Nipple Licking. She's My Divine Classmate, Nagisa Koi.