瑞本つかさ先生の【エッチ】を覚える大人の性教育レッスン!!

The main character has never kissed or had sex with girls. One day, three female teachers appear in front of him and start a sex lesson. If he completes it, he will be a sex expert!? The more the lesson goes on, the more bold it gets. There are "Lecture Part" and "Hands-on Part". You can enjoy various sex lessons from three teachers. Now lesson start!