It looks like you're referring to the adult visual novel Hakujitsumu (白昼夢 – "Daydream"), likely the version published by or related to its anime adaptation.
Always confirm the product page says "Uncensored / No Mosaic" and check the listed runtime. A drop from 60 min total to 44 min total is normal for a "clean" re-edit. A drop to 15 minutes would be a heavily cut "digest" version – not worth it. Hakujitsumu shorter runtime but uncensored ve...