From the height of happiness to the depths of despair... Life is full of uncertainty! One day, Kouji decides to take a leap of faith and confess his feelings to Chiharu, who lives next door. Although she seems taken aback, she accepts his confession and the two start dating. Perhaps it's because of Kouji's innocent way of treating her, but Chiharu quickly opens up to him, and the two even end up sharing a bed together. For Kouji, it's the height of happiness. Just when it seems like they'll tie the knot, Chiharu's past appears with a dark shadow...