Is there any excuse for a high school girl to be going out alone with her crush who already has a girlfriend? That's exactly what Nukumizu and Yanami are determined to find out. When they spot Yakishio alone with her childhood friend Ayano, the two team up with his girlfriend Chihaya to figure out what on earth is going on. He might already be taken, but Lemon's not yet ready to let go of her feelings. Could she be planning a boyfriend heist?