Kamen Rider ZEZTZ — Episode 18: Case18: Shoot

You are watching the episode Case18: Shoot In his dream, Baku, now a high school student, must protect his classmates—Nasuka and Kureha—from the Nightmare orchestrating a death game.

As students fall, Kureha takes up a gun and challenges the Nightmare to battle. Seeing Baku intervene, Kureha murmurs, "...Seven." Why does Kureha know that name...!?