The file you mentioned, Nais_Training_Diary_Uncen.rar , is a compressed archive containing an "uncensored" version of the game. In this context, "" likely refers to:
Training diary - Recording, monitoring and evaluating performance ... - BBC File: Nais_Training_Diary_Uncen.rar ...
" Nai’s Training Diary " is a simulation game, typically available as an APK for Android, that belongs to a genre of visual novels similar to Teaching Feeling . The file you mentioned, Nais_Training_Diary_Uncen