Kiyoshiro visits a shrine in Kyoto on a school trip. From then, someone starts to come pick Kiyoshiro up at night and challenges his knowledge. He then slowly starts forgetting things he should know…
Hiro's study files!
!ملفّات دراسة هيرو
¡Los archivos de Hiro!
¡Los archivos de Hiro!
sui 
Digimon
Arquivos de Investigação 
de Digimons do Hiro!
Познавательные уроки от Хиро!