That's a pretty weird definition, you know XD but if I got it right, you're looking for some series that focus on comedy, and have slow-burn romance, right? Those are some of my favorite series as well after all, and they're just so addicting! You could try these out (since they're ongoing in most of them the romance is still building up, but it's looking good already!):
One Of a Kind Romance
This Girl is A Little Wild
Utakata Dialog
Rikei ga Koi ni Ochita no de Shoumeishitemita.
Misoshiru de Kanpai!
Why Naitou
Wotakoi: Love is Hard for an Otaku
Dear Future You
Takane to Hana
Pseudo Harem
Why Are You Doing This, Duke?
Spirit Fingers!
Kono Oto Tomare! (the romance is not the main focus in this one, and it takes a lot to kick in, but once it starts it's just way too good!)
Our Relationship Is... (this one is completed and it's probably the one that fits what you're looking for the most)
