Seiichi and Airi are sent to the world of the dead by Demioros' Deliverance and have to search for the Gate of the Living and overcome its trials in order to return to life.
Not the Gate of the Living, 
but your personal gate!
Nicht die Pforte der Lebenden,
sondern die Pforte von Sei-chan!
¡La Puerta de los Vivos, no!
¡Tu puerta trasera!
¡La Puerta de los Vivos, no!
¡Tu puerta trasera!
Non il Cancello dei viventi, 
ma il tuo cancello personale!
Não o Portão dos Vivos,
mas o seu portão pessoal!