Shizuki-chan has it rough, she knows Sakura-kun likes her too but they keep getting interrupted in the most ridiculous ways haha! She found the ring and it didn't fit Sakura got the wrong size! She could use it in a necklace though. I know that Sakura will fall in love with Dokuro-chan or else he wouldn't invent the technology of immortality that was a side effect of that keeping women with a young appearance haha! It is a time paradox, Dokuro-chan went back in time to stop him from invention that technology, but if he had never met Dokuro-chan then he wouldn't have a reason to create immortality technology and offend God who sent her back in time to kill him. A total absurd love comedy hehe!