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I have a relative, "Big Sister Honami" who has been looking after me since I was little. I haven't been able to see her for a few years because she moved to Tokyo to continue her studies. My sister is now a working adult, and I moved to Tokyo to become a university student. Just as I was getting used to university life, I got a message from my sister. "I'm late, but I want to celebrate your university entrance, so let's meet up." I was invited to her house, and since it had been a while since we last saw each other, we had a lively conversation. However, when she heard that I had a girlfriend at university, she started acting strange...