Koe de Oshigoto!

Growing up in their single-parent household, Kanna knows that her mom and big sister Yayoi always do their best to make sure she has the best life has to offer. So when said big sister asks Kanna to help out with work, she can't help but say yes - but will Kanna ever be ready to lend her voice to the kind of video games Yayoi has been making?
(Source: Manga Planet)