Shy Reina Katori makes her debut as a chat girl, receiving hands-on coaching from her instructor on how to attract customers. But amidst the lesson, things take a lewd turn as she gets caught off guard and ends up getting fucked. Nervous and tense during her first time, she's swept into an unexpected situation. As her relationship with the instructor deepens, her emotional turmoil unfolds. How will this intimate, life-changing experience transform her?