Bright shout-out first: if you’re looking for the most approachable, bang-for-your-buck kiss-focused manga, start with the debut volumes and a few pivotal later ones that seal the emotional arcs.
I’d pick up 'Kiss Him, Not Me' volume 1 to get the comedic rom-com energy and meet the cast, then keep going through volumes 2–4 if you love slow-burn misunderstandings and teasing kiss moments — the anime adapts the early chapters, so the manga gives much fuller context. For something softer and sapphic, 'Kiss and White Lily for My Dearest Girl' volume 1 is essential; its early volumes are a beautiful exploration of feelings and the kisses are meaningful, not just spectacle. If you crave fantasy-flavored romance, grab 'Kiss of the Rose Princess' volume 1 to see how magical elements complicate first kisses. Lastly, if you don’t mind ecchi comedy, 'Kiss x Sis' volume 1 shows why its risqué kiss scenes are infamous; later volumes lean into the gag vs. emotional payoff tension.
Pair these with an omnibus or digital collections if you want binge-read convenience, and skim reviews if you prefer content warnings (some of these swing mature). For me, those first volumes hooked my heart and curiosity — great entry points that still leave me smiling.