Koe de Oshigoto [TV]

Aoyagi Kanna, is a 16 year-old girl who was asked to become an eroge seiyuu (voice actress for erotic games) on her 16th birthday by her 28 year-old sister at her eroge company. She disagreed at first, but after she thought about all the things her sister did for her she finally agreed. But being a high school student and knowing nothing about eroge can she do the job properly?