[A full-scale drama where the Kokoro wavers between a female teacher and another woman!] Aika became a teacher because she admired her former teacher from high school. A new student, Ito, transfers to the school and tells her that her former teacher was Ito's father, who has since passed away. Although shocked, Aika begins to notice the resemblance of her former teacher as she tries to open Ito's Kokoro, which has become cold after the death of his father and the change in his environment. Ito also becomes attracted to Aika, and one day the two impulsively become united. Their relationship becomes deeper and stronger...