Edit:
Due to new guidelines, the artist had to delete his old gallery. In the collection where he has now uploaded it, there are also 3 unused pictures.

Link to the Collection:
https://www.pixiv.net/en/artworks/104551257

The artist says that all his works are free and freely available, but if you still want to give him a little support:
https://www.buymeacoffee.com/ManicoCoffee