Ritsu and Mio have been the best of friends ever since they were in primary school. Whenever this topic comes up in the light music club, Mugi suggests in a subtle way that they should eventually move beyond mere friendship and become lovers. The idea was also proposed by the Mio Akiyama fan club and even their class picked them to play the main roles for Romeo and Juliet. Azusa agreed, stating they were two peas in a pod, while Yui was completely oblivious.

What no one knew was that Mio had previously had one boyfriend and she and Ritsu talked about their moving beyond friendship everyday.

"I don't know if I'm ready for this yet." Mio said, sighing. "My love for him is still quite fresh... Even though he dumped me..."
"I guess the pain is kind of fresh too." Ritsu muttered bluntly.
Mio shot a glare at Rtisu and raised her fist. Ritsu held up her hands in surrender as Mio's fist came flying straight into her head.
"AIIEEEEE!" Ritsu squealed. "I'm sorry!"
Mio calmed down and smiled at Ritsu, her cheeks beginning to flush. Ritsu always thought that she was more beautiful when her face was red with either anger or embarrassment.
"Ritsu, let me tell you what I think." Mio began, her cheeks continuing to turn crimson. Ritsu waited for her response.
"I do love you, Ritsu. But I love you as a sister. I've been doing a lot of research on this-" Mio stopped, and took a deep breath as Ritsu cracked up at her last statement.
"You?" she chuckled, "Research?"
"Are you going to let me continue or not?" Mio asked, her face completely serious.
"Yes yes. I am." Ritsu replied and grinned back.

"Lovers come and go, Ritsu. But sisters are for life. They bring out the best in each other and they're at their craziest with each other. I don't treat you like I treat anyone else. And I think it's the same for you." Mio sighed, as she finished and smiled.
"So, we're soul sisters?" Ritsu asked, bewildered, "You know we can become lovers whenever we want, right? Besides, you never say sappy things like that..."
"Aren't all my songs sappy?" Mio narrowed her eyes and then gave her a meaningful look, "But the question is, do you want to become lovers because you want to? Or to satisfy everyone else? Are you alright with us being the closest anyone can be by being soul sisters?"

Ritsu thought about it. Those were difficult questions to answer...