Nukochi (@nuko0923)'s mostly complete collection, this includes artist's old Twitter, Pixiv, and Patreon posts, some of the artist's old post's resolution was quite small (600×600 etc.), I deduplicated them manually and removed some SFW ones, renamed and sorted in time order (oldest-newest), I personally recommend view the collection in reverse time order, since the artist's skill improved quite a lot during these years.
The latest Real-ESRGAN image restoration model was used to upscale (4.0x, as the training model was designed for) and restore (denoise, remove JPEG artifacts) the image.
Some file's final resolution has to be limited to 8K level using Lanczos resampling as the E-Hentai server has a 10 GB upload limit, this results in 2.0x~4.0x effective scaling.
This is a huge project, the Real-ESRGAN took about 40 hours to crunch down all 800+ images on my machine.
All uploaded pics were compressed with lossless PNG format.