Service Time ga Owaranai
That gecko scene had me internally screaming. If that happened to me in real life I would be hysterical. This short manga somehow manages to put cute fluffy romance with a bit or angst, some very light comedy, and then a bit of smut all in its few chapters. Although this is overall a light-hearted romance, I mostly remember it for its angst bit because it's written so well. That feeling of going from being on cloud nine thinking you might have a chance at love, before suddenly plummetting into a pit of disappointment and heartbreak when you realize you were mistaken all along. I like angst in small doses and this is just the right amount. Of course, afterwards you're treated to a lot of fluff so it's all gucci.
Itsumo Ouji-sama ga
Funny how the first time I read this I got pissed at the characters and the seme especially but now several years later I'm reading this again and it's actually cute.
Nichijou Climax