Best Girl from Infinite Stratos

Who is your own honest opinion even if you're not a fan of the series is the best or favorite main girl in IS for a pool party?

Infinite Stratos: Beach Scene (Season 1 Episode 9)

In this episode, Ichika and the main cast along with the other girls from IS Academy are taking a beach study session and during that, each of the girls tries to get close with Ichika, but their efforts failed and later the students and staff then enjoy a game of beach volleyball.