Enjoy the Diner
For me a few hours is the right length for a visual novel because it's about the length I prefer fiction to be in general. Some people are very attached to their million-word epics, and I get it--I used to be, too. But now I'm most interested in what a writer can do in the range between a long short story and 80,000 words or so, given room to breathe but not enough to belabor the point. I'll read series of related stories, but I like it when each has a beginning and ending.
This is all to say that I played Enjoy the Diner, the translated version of this. It took a little over 2 hours, though there's another ending I could get, I think. It's good if you like things like this, which you should know right away; just look at the store page. A little mystery game for people who like tsukumizu and also remember staying up all night with friends at IHOP or your local equivalent, drinking bad coffee until it made you sick.
Don't want to give too much away here, but if you're curious, here's an interview with the developer.