The cultural anthropology club at a school in the remote Japanese countryside is doing a report on the AoOni, a mythical creature that inspired a hit video game.  They find that the AoOni was based on a creature who may live in their own area.  But things take a horrible turn when they learn that the creature might still be real, and that the creator of the AoOni game has just committed suicide before they were to meet with him...
I found out from his diary that when he 
was doing field work in the mountains,
Aus seinem Tagebuch erfuhr ich,
dass er bei Feldstudien in den Bergen
Según el diario de mi padre,
Según el diario de mi padre,
J’ai trouvé son journal,
E fu leggendo il diario di mio padre
O diário de quando ele fazia 
trabalho de campo nas montanhas