Ao no Exorcist episode 4

It aired on Sunday, 8 May 2011.

The Garden of Amahara

Yukio sets out to the school's Exorcist-only shop to stock on some supplies along with Rin. There they find that the owner's daughter, Shiemi Moriyama, is being afflicted by a demon that dwells in her family's garden and, to save her life, they confront it by themselves.