Some CGs can only be unlocked by viewing the Dead Ends, and by the sounds of things, you haven't unlocked the alleyway CG as well. To obtain it (and get the option to kick someone in the leg), you just need to pick all the "mean" options, then dismiss Ren at the beach during Day 5. Choosing to encourage Ren's dark behaviour is completely optional, but encouraged if you want to 100% guarantee getting the CG.
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Are you going to put this game on Steam? text me as soon as you can. Steam link: https://store.steampowered.com/ Time; 7:55 PM