Fuyu no Sonata: Joshou - Hatsuyuki no Negai

冬のソナタ 序章 ~初雪の願い~

Based on the Korean drama television series about the love between two childhood friends and the tragic events that happen. In terms of the timeline of the Winter Sonata series, it belongs in the time gap midway through episode 21. (Source: Frostii Subs)