When the narrator plays a role with some vivid action-cum-description
Lengthy and rich content omake, free talk, voice-over commentary, sfx making, etc
Individual clips of sound effect audio file included. Could well be something to delete.
看取られ. Be with you and watch as you fall into sleep / eternal sleep / death.
Ta-ru! Fuck Gust-chan! Include witches that do alchemy. Often has homunculus.
These are the works from my personal collection, which means that they have added metadata for better organizing (picture, cv, circle, date, genre, sometimes even tags for specific track in composer field) everything written into MP3 file. But the fact that its from personal collection means, that there may be also some missing files if they are duplicates only with different effects. Note - metadata were edited under japanese locale OS, so there may be errors if your system is set to non-japanese.
Monaural audio only, no binaural (don't count those with a mix of them)
For imersion/imagination, according to illustrations only. May not have any role (such as the famed under-mask blowjob)