Just the Two of Us, in the Dark - S1.E18

Ruka explains to Mikan why Natsume acts the way he does. The three end up at the hunted house attraction. They enter the hunted house and Mikan gets scared by everything whether it's scary or not. While running away from a scary old lady Natsume and Mikan get separated from Rukia and worse get trapped in the house by a wall that suddenly appears!