The final piece, indicates that you are not looking for the original 2012-2015 releases. You want:

: The plot follows various couples—beginning with characters like Yui Obata and Taiki Tachibana—who are forced to undergo "instruction" from Tanaka while their partners watch the events unfold like a live tutorial. 🔍 Breaking Down the Search Across "All Categories"

This is the primary portfolio site for Japanese artists. Aiue Oka’s official Pixiv ID is 73135826 . This is where they post high-resolution art, some of which may not be shared elsewhere. Searching for the artist name or the title in Japanese on this platform will yield the most direct and complete results.

If your indexer allows category sorting, narrow your query manually:

A4: There is no single “all categories” button that works perfectly. Use the following strategy: Go to a general search engine (Google/DuckDuckGo). Search for site:pixiv.net 催眠性指導 (for images). Search for site:blog.jp 催眠性指導 (for news). Search for Saimin Seishidou VNDB (for games). Using site: tags forces the engine to show you results from specific categories of sites.