Aka Onda

A 20-year-old aspiring seiyuu who idolizes Audrey Hepburn. She is a little eccentric in her actions as she often quotes movie lines from films Audrey Hepburn starred in. It is very easy to mistake her for a minor, so the first episode can be a bit shocking until we learn her age. She lives with Matsumaru in his apartment, and usually asserts that she is only friends with him, despite the fact she and Matsumaru slept together the first night they met. This provides the crux of the remainder of the series.

(Source: Wikipedia)