Well, it's hard to say. Maybe 'Maga Tsuki' manga features elements related to rock music or has a story involving the rock culture. But without more context, it's difficult to be certain.
It could be a story about a journey in an isekai (another world) guided by the moon. In manga and novels of this kind, there are often unique characters and fantastical settings.
I'm not sure specifically as there could be many different 'tsuki tsuki light novels'. It might be about a variety of themes such as fantasy, adventure, or relationships. Without more context, it's hard to say exactly.
The reaction of site.com to manga can vary greatly. It could be highly supportive, promoting and featuring manga prominently. Or it could have a more limited engagement, only showcasing selected titles. It all depends on their business strategy and target audience.