Masahiko is obsessed with finding a kind girl who helped him during his childhood, though he cannot remember her face. When Sha Fong Lee, a skilled martial artist from America, moves into his home to study under his father, Masahiko hopes she might be the one. Despite an initial clash of personalities, the two form a deep romantic bond through karate training. However, just as they grow close, Fong Lee reveals she is not the girl from his memories and departs for America, leaving Masahiko to continue his lifelong search.
After dealing with unwanted advances from a classmate and a teacher, Masahiko goes on a ski trip with Asuka and Kyoko. When Asuka confesses her love, she reveals a shocking truth: the mysterious girl from Masahiko's childhood memories is actually her sister, Kyoko. This revelation allows Masahiko and Kyoko to finally reunite and fulfill their long-held desires for one another.