S01E01 Episode 1
Nurse Tsuyuko falls for high school teacher Santa at first sight, despite the fact that he is engaged to Tonaka. Meanwhile, he tries to encourage one of his students to pick up playing the flute...
After Hanako has sacrificed herself to save Santa from Tsuyuko, and ended up losing the ability to walk, Santa devotes himself to her and marries her after all. Three years down the line, Tsuyuko controls Akari's life to the point that Akari no longer wants to to live.
Tsuyuko Hoshino, a nurse, meets high school teacher Santa Fuyuno at a café for musicians and immediately falls for him. Despite knowing he is engaged, she becomes obsessed with him. Unbeknownst to her, her own daughter Akari is taught flute by Santa and their relationships develops beyond that of teacher and student.