Rin Okumura, a boy aiming to become an exorcist yet born the illegitimate son of the demon god Satan, advises his classmate Sei Godaiin, who begins to see demons. Despite Rin asking Ryuji Suguro and the other Exwires attending the Exorcism Cram School for a way to make demons invisible, he is unable to find a solution. Meanwhile, Rin is invited to dinner by Mephisto Pheles, the Preceptor of the Japan Branch of the Knights of the True Cross and director of the True Cross Academy. However...
Your demon heart
has been sealed inside this sword.
.خُتم قلبك الشّيطانيّ داخل هذا السّيف
In diesem Schwert
ist dein Dämonenherz versiegelt.
Tu corazón de demonio
está sellado en esta espada.
Tu corazón de demonio
está sellado en esta espada.
C’est dans ce sabre
È in questa spada che 
è stato sigillato il tuo cuore da demone.
O seu coração de demônio foi
selado dentro desta espada.
К слову, внутри этого клинка
запечатано твоё демоническое сердце.
"หัวใจปีศาจ" ของคุณถูกผนึกอยู่ในดาบเล่มนี้