Sakurako and I have been in love for a while, and we are both thinking about getting married. Today is the day I go to meet my girlfriend's family, and she told me that she has an older sister who is a yoga instructor. And this sister is a siscon... When I met Sakurako's parents, their expressions were oddly stiff, and they vehemently opposed our relationship. That night, while I was sleeping, I dreamily discovered sister Yuko shining some light onto Sakurako. The next morning, Sakurako acted as if she didn't know me and kicked me out of there. Faintly guessing what was happening, I secretly took sister Yuko's lamp. But since I still didn't know how to use it, I couldn't make my girlfriend go back to how she was before. Unexpectedly, that sister came to my house, rummaging around to find the lamp. While arguing with her, I accidentally hypnotized her and started my revenge plan. Just as I was feeling triumphant about my success, something I didn't expect happened...