S1·E11 Till Death Do Us Part

Tokiko proceeds to eliminate the twins but is stopped by Kazuki who argues that they are still human and deserve to live. Shusui inflicts a critical wound on Kazuki while he is distracted. However, Ouka uses her buso renkin and absorbs Kazuki's wound damage claiming that Kazuki is someone they can trust. As Ouka begins to die, Kazuki, Tokiko, and Shusui are able to avert her death with the healing properties of the kakuganes. The next day, Kazuki and Tokiko visit Ouka in the hospital who reveals that her brother had left to train in order to rid himself of LXE's corruption.