parasocial
Rare technical term used in psychology and media studies to describe one-sided relationships, such as those with media figures or fictional characters.
The concept of parasociality is used to explain the one-sided relationship between viewers and TV characters.
The katakana loanword パラソーシャル is more common in modern Japanese discourse, while 側社会性 is a rare kanji-based translation.
A Japanese coinage from 側 (side, one-sided) + 社会 (society) + 性 (-ness, quality), likely a calque of English 'parasocial'. The exact derivation is uncertain.