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Riho has a very strong libido and her boyfriend dumped her because of it. Meanwhile, her younger brother Takeru quit his job due to bullying and became a recluse at home. When Riho discovers a handwritten shoulder massage ticket that her brother gave her 10 years ago, she comes up with a clever idea to cheer up her depressed brother while also satisfying her own libido. She shows her brother the shoulder massage ticket and thanks him for the shoulder massage, then gives him 10 condoms in return, saying, "In return for the shoulder massage ticket, I'll give you a vagina massage ticket. Use this to cheer you up." She presses Takeru.