Kumiko has Tsukamoto's hairclip. Too bad for you, KumiRei shippers.
First, that's a spoiler and some people who don't know anything about the anime and the source materials can read this. Second, you're doing nothing good by gloating over people because Shuuichi and Kumiko is possibly dating; good for you, but doesn't mean it should be bad for others. But it has relatively no importance to the plot and we have only this picture that implies anything (besides the novels where this is canon), so I'd be kinda bummed out by it if I'd be a hardcore shipper because I'd want more than a fucking picture where Shuuichi isn't even there.