I Wouldnt call this a harem at all. i wouldnt really know what to call it. the first 50 or so chapters are just shorts and there isnt really much of a story at all untill much later. Also it wont take you very long to read considering all the chapters are very short. I think its a cute read so Id give it a go.
Rather than harem right now it's more like a multi-couple series. It alternates between 2 pairs and then in between arcs we'll get a chapter with all 4 hanging out. Depending on how far you've gotten you've probably already figured that out.
Is it like harem? One boy can't decide what he wants? Is it worth reading? I'm not sure if I want to start it, since its SO long xD