A story about childhood friends, a man and woman, who got married after a condom broke.

Hara Yuuichi and Saeki Yuka are an admittedly lovey-dovey childhood sweetheart couple currently living together. In the autumn of their fourth year of university, after being intimate late at night, the two notice something. "The condom broke!" The two, their faces drained of color, frantically search for a hospital that offers late-night consultations... This is the story of two lovers whose resolve was strengthened by a small accident.