I'm not sure there's a direct connection. Maybe it's just a theme or element used in the manga, but not related to rock music specifically.
It's hard to say. 'Koi to Natsu Tsubaki' manga could potentially incorporate rock-inspired elements in its art style or story, but it might not have a deep or significant link to the concept of rock in a conventional sense.
I think it could be that the manga features characters who are into rock music, or maybe the setting has something to do with the rock scene. But without more context, it's hard to be certain.
If you want the clearest chapter reference, go to Chapter 219. Early on, Qi Tianyu was somewhat freaking out.; later, the chapter leans on The eagerly anticipated bed of roses had turned into pink roses..
Chapter 154 is the strongest chapter-level answer because it starts from Hahaha, I'm dying of laughter, Lili, do you really have to be so blunt?"... and follows through on Helplessly, Director Sun could only grit his teeth and add another 5....
If you want the clearest chapter reference, go to Chapter 173. Early on, Jiang Li finally rose from her seat.; later, the chapter leans on Seeing her stand up, He Yun also stood up..
Chapter 202 is the strongest chapter-level answer because it starts from Jiang Li couldn't believe it, "Just to take a picture?" "Yes, just to take... and follows through on Give me the card." She stretched out her hand expressionlessly..
The best chapter pointer here is Chapter 207, "Keep these thirty points for yourself, I don't need them". It opens with After finishing, Sister-in-law Lan quickly took out the Good Evaluation... and closes on She had taken care of them for a longer time, she hadn't even had lunch,....
If you want the clearest chapter reference, go to Chapter 172. Early on, Not only Shu Yan, but the entire internet was shocked when they saw Su...; later, the chapter leans on Damn, what brand of make-up is Su Yinwan using?.
Chapter 182 is the strongest chapter-level answer because it starts from At this moment, Qi Tianyu, who had just arrived in the Capital, couldn't... and follows through on But Director," the assistant said, "are you really going to let them keep....
Look to Chapter 174 for the clearest answer. It begins with Does Young Master Jiang really care why I would come here?, keeps building through I'm here for the same reason you are." He had previously suspected the..., and lands on She knows the camera is on her, how can she still..." Jiang Li.
Chapter 220 is the strongest chapter-level answer because it starts from I know everyone has many questions, and I'm here to answer them one by... and follows through on However, Su Yinwan and Shang Shaojing weren't particularly attentive to....