"Stupid and annoying? Planning something?" Rika thought to herself, pausing halfway between the door and her roommate with her right hand still extended in greeting. Could it be that Himawari-san had somehow already figured out her true form deep down below her idol exterior? No, that couldn't be it. So far the only interaction the two has had together was her knocking and introducing herself, as far as she could remember. Had she somehow already been stupid and annoying during that time? She remained motionless while she considered what to do next. Then it hit her. She had played the part of some tsundere's before, so perhaps this was this very scenario. She'd need to be careful as to not make an enemy of her, especially if the two had the share the same room for the entire school year. Her mind raced with ideas how to counter this new "tsun" threat and turn this girl to the "dere" side of the tsundere. Her character had managed to overcome the problem with the help of a shounen hero. She'd have to somehow take on the role of such a character but in real life. It might take time, but she just might be able to succeed if she used all of her knowledge of this issue to it's fullest potential. 

"Don't worry my little Tsundere," she thought to herself, "I'm willing to take all of the tsun you can deal out if it's to save you!" 

She went down on one knee to get within eye reach, extending her hand right in front of her even further so that it cannot be ignored. 

"Don't worry, Himawari-san. I'm sure we'll get along just fine. You have a lovely plushy collection, by the way," she said elegantly. In the background she could hear some sort of foreign sounding heavy rock blasting through the walls, but it had since died down. Rika herself was way more into pop, which is the genre that most idols sang, but to each their own, she guessed.