Scenarios where they are not biologically related.
While the official game portrays them as a tight-knit and supportive sibling duo , the "-Rinjo18-" tag is a hallmark for those seeking a specific artist's interpretation of their bond. These works often focus on: Belle x Wise -Rinjo18-
Subreddits like r/ZenlessZoneZero often discuss the "Phaethon" dynamic, though explicit "Rinjo18" content is usually restricted to NSFW-specific boards. Scenarios where they are not biologically related
Search for the Japanese names of the characters (哲 for Wise and 铃 for Belle) alongside the artist's tag. Belle x Wise -Rinjo18-