Their Secret... - S1.E3

Once the Plant Undead is sealed by Chalice, Blade asks to join forces, but is rejected. Shiori is able to contact Karasuma and they begin searching for him. When the Deer Undead appears, Garren goes to fight it but is unable it defeat it until Blade shows up. Blade seals the Undead and questions Sakuya's intentions. Sakuya then tells him that the Kamen Rider System is killing them.