The premise is pretty simple. In Japan, a lot of places have what they call 'point service' in which you can earn different rewards by going to that store frequently. The maid cafe in question here offers, as its highest reward, the chance to tickle one of the girls who work there. Thus what you have is this guy, who seems like your fairly typical college student (studying design and works part-time in a clothing store) who, once he sees that he can tickle the one girl he likes if he has enough points, starts going to the maid cafe in question a lot for the purpose of building up said points.
It has a number of details that imply he hasn't got too much money, and moreso since maid cafes are super derp expensive (the actual price isn't ever mentioned, but yeah) but he's basically putting in all his effort to get to tickle the girl, whose name is Sayaka. Finally, he earns enough points and proceeds to tickle her while the other two girls hold her arms. The details of the tickling scene are fairly vanilla and nothing you can't figure out just by looking at the pictures.
It's implied during the class scenes that he really isn't all that popular with girls and has to pass on doing fun stuff because he's either working or at this cafe, but there's a sort of postscript where, a few years later, you can obviously see that he's gotten a job at some sort of design firm and is somehow now much more popular with girls (they invite him out for tea in the last few pages, but he declines). It doesn't seem quite clear what happened between him and the girl, but I think it's implied the email he receives at the end is a link to a new tickling cafe that's cheaper and has better options than the maid cafe he goes to, but in the end he keeps going to the maid cafe because that's where Sayaka is.
You figure that if this has been going on for some years as it seems to be, and he's got a good job now, they'd be together, but... I dunno. What I think confused me is that, despite the girl on the tickling cafe webpage looking a lot like the girl he likes, it's not actually her. Not one hundred percent on those last two or three pages. Anyhow, for the record, this was a doujin made by a guy who ran a tickling site a few years ago, the website where the quasi-famous Tickling Tower story was posted - that's the one that has a bunch of very well-drawn tickling pictures that were found in between reams of Japanese text, and his site also had other random tickling pictures before closing down two years ago I think. His name escapes me at the moment, however. These guys also did a collection of random tickling pictures in addition to this doujin.