While going down memory lane I found this reinterpretation of the opening theme, Shizuku by Sukima Switch (the first people who sang it from ep 1-30)
https://www.youtube.com/watch?v=ou6U...UgcE5RApYAks9Q
The video was uploaded by Youtube's automated content generation algorithm so I think it should be safe to post, but I'll happy to remove it if that's not the case.