Yui Kiryu appears pure and considerate, always attentive to others. Despite strict rules against side jobs, she's caught working at a hostess bar. Still dressed in her tight-fitting club outfit, she's taken outdoors and stimulated with a remote-controlled vibrator. Soon after, her secret AV work is exposed, forcing her into "training" as a new teacher under the supervision of male faculty members. Intrigued by her sincerity and obedience, the instructors progressively intensify her education regimen. Yet as time passes, Yui's eyes gradually begin to sparkle—her heart increasingly captivated by the unique pleasures of womanhood.