Erina joins the Nadesico at the same time as Nagare and proves to be just as irritating to the other characters.
Her official post is co-helmswoman, but she ends up pushing orders onto everyone around and even the captain.
She has a great fascination with Akito because of his boson jumping abilities and constantly confronts him to become a experiment guinea pig.
In episode 22, she cries when Akito leaves, which may hint at her feelings for him.
She makes a really brief appearance in the movie.