This series makes me very happy.
Honestly, as much because they have such a sweet (but fairly real and down-to-earth) relationship as anything. Meguru's appearance, occupation and mannerisms give something to center subplots and day-to-day conversations around, but it's fundamentally a no-drama comfy slice-of-life romance.
Well... that said, Meguru's inherent charm as a character (and that of all the other characters) is carrying this as well. But if you don't think a boy who sports makeup and nails and style just because he wants to is awesome, that's your problem, not mine.