I understand you're looking for a proper academic-style paper or analysis regarding a specific piece of content — possibly a game, fan work, or doujin title — with the name “Silly Girls Quest v120 Izakaya Yottyann Extra Quality” .

: Often denotes a version of the game that includes high-definition assets, uncensored content, or additional "deluxe" features not found in the standard base game.

" might be a specific name for a fan-made modification, a niche asset pack, or a localized version of a game (likely related to the Touhou Project Mystia's Izakaya While "Izakaya" refers to a casual Japanese tavern and " Mystia's Izakaya " is a well-known fan game where you manage such a shop

Many of the static scenes have been replaced with "Extra Quality" (EX) versions, featuring smoother transitions and high-frame-rate animations.

: Likely a specific location (an "Izakaya" is a Japanese-style pub) or a major quest hub introduced or revamped in this version. Extra Quality