Ep. 4: Un flashback revela el pasado de Takamasa e Itsuki como equipo y la transformación de Tomoharu en un Shikabane.

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The episode shows a flashback when Takamasa and Itsuki became a team about four years ago. After having died in a bus accident, Itsuki became a Shikabane Hime under Takamasa. The two struggled with a Shikabane in the form of a werewolf at first, but they managed to gun the werewolf down after a second encounter. Although they have grown closer with each other, Takamasa was reminded not to treat Itsuki as a normal human girl. Itsuki transferred as a student with Takamasa, befriending fellow classmate Tomoharu Kishibe, who was aware that Takamasa loves Itsuki. One day, when Tomoharu was heading out-of-town with his parents, they were hit by a reckless young driver, swerving their car off a cliff. It is revealed that Tomoharu became a Shikabane four years ago to control the cars driven by young drivers and cause collisions. As Takamasa could not bring himself to permit Itsuki to kill Tomoharu, she suddenly transformed into a Shikabane. After accidentally wounding Takamasa in the process, she reverted to a Shikabane Hime. Learning his lesson from the past, Takamasa unhesitatingly allows Itsuki to shoot Tomoharu. (Source: Wikipedia)