If you are looking for specific media associated with this string, searching under clean, separated terms (such as the specific artist's handle alongside the character name) on platforms like Pixiv or dedicated art archives will yield much more accurate results than using the concatenated phrase.
The search results for "Shiina Ecchigawa" and "Ruby Hoshino" together do not yield any results. The keyword also includes "the full animat". I should search for "Shiina Ecchigawa full animat" or "Ecchigawa full animat". 0 is "[Japanese] - [250914][Shiina Ecchigawa] Darkness ～A Lady Knight's Pride Broken～ - The Full Animation!". This seems to be a post on an anime-sharing site. The keyword includes "the full animat", which might be a truncated version of "The Full Animation". This could be the article the user is looking for. I should open this page. page is about a "Full Animation" by "Shiina Ecchigawa", but it's from 2025, not 2021. The keyword specifies 2021. However, this could be a similar type of content. The user's keyword might be a garbled combination of various tags or titles. "Ruby Hoshino" is a character from "Oshi no Ko", which started in 2020, but its anime adaptation was in 2023. There might be fan animations of Ruby Hoshino from 2021. I should search for "Shiina Ecchigawa Ruby Hoshino 2021". 8 is a Patreon page for Shiina Ecchigawa, dated 2021-11-23. This might be relevant. I should open it. is an age-restricted Patreon page. It might contain the "full animation" the user is looking for. shiinaecchigawarubyhoshinothefullanimat 2021