I met my first girlfriend, Ichika-chan, at a volleyball club. She's cute, kind to everyone, and has big breasts. I've always liked her, so I took the plunge and confessed my feelings to her, and we started going out right away. I thought our days would continue to be happy and joyful. However, I gradually began to notice something unusual about her. That was, she had low standards for chastity and would have sex with anyone. One day, I witnessed her being passed around by all the members of the club, all with a smile on her face...