Rika and I have been dating since high school. Maybe because we have been in love for a long time, our feelings are not the same as before. Recently, Rika has been dating a senior man who is better than me in every way, which makes Rika feel wavering. That man is going on a trip and asked Rika to go with him. She agreed and took this opportunity to confirm our current status. Although Rika did not say anything, I still felt that something was happening. While sitting alone in the park near my house, Konan-san passed by. She knew everything, she sat and listened to my confidences, talked and helped me feel better. On the day Rika went on the trip, she waited for me outside the door and offered to replace Rika as my girlfriend for three days! And during these three days, I felt like I was back to the time when we first fell in love. I learned more about her and gradually developed feelings for her. I tried to confess my love but she refused. I am her sister's boyfriend, Rika. There will never be any results between me and her...