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Chapter 12.1 is generally categorized as an extra or "bonus" chapter. In this specific series:
Mengo Yokoyari (best known as the illustrator of Oshi no Ko and the creator of Scum's Wish ). Genre: Seinen, Drama, Romance, Slice of Life.
The text you provided decodes from percent-encoded UTF-8 to the Japanese title: ( Hitozuma no Kuchibiru wa Kan-Chu-Hai no Aji ga Shite ), which translates to "The Married Woman's Lips Taste Like Canned Chu-Hi."
The "Canned Chu-Hi" motif is a recurring symbol for "cheap" or everyday adulthood—contrasting the mundanity of married life with the sharp, temporary sting of an affair or a forbidden attraction. Where to Read
These "point" chapters (like 12.1 or 12.5) often serve as short, atmospheric vignettes that flesh out the emotional state of the characters rather than advancing the main plot significantly.
True to Mengo Yokoyari’s style, the chapter features delicate linework and a focus on expressive, often pained or yearning facial expressions.