Haru is a member of the idol group Horny Sentries that performs at the Mizuryuu Kei Land event stage, the Idol Popularity Cunt-est. She also, like Ryoko, states that Yuka isn't completely into their performances and agrees with Ryoko's observations of her.

Come to the biggest sexual entertainment park in the world, Mizuryuu Kei Land! A place where you can enjoy safe sex with everyone as much. This is where the dream can be grasped. 
 
(Source: Nekopoi and Has Been Translated and Edited)

Come to the greatest sexual theme park in the world, Mizuryu Land!
 
Note: Originally self-published under the name "Oide yo! Mizuryuu Kei Land (おいでよ!水龍敬ランド)".