Watch on Soap2day. The Winter Butterfly is a story about passion and love, depicting Matsunaga a samurai, as a corrupt oppressor rather than a hero. With the emergence of a new system during the Meiji period, many things changed in Japan for the sake of progress. The story told in four parts is related to the seasons of the year, which can be scorching, amenable, cold or unpredictable. All evoked by Stephen Warbeck's beautiful and sensitive score.