The harem genre is overplayed, to the point that most gimmicks (a harem of monstergirls, aliens, superheroines, etc.) have been done before and there's hardly room for a novel premise to carry such a series. Good execution is the main measure of a harem work, and when the genre conventions demand such a large cast of characters that means making the most of each one.
Almost every single cast member is an enjoyable addition in and of themselves, and they further interact with the other girls mostly cooperatively and helpfully, rather than tired comedic competition and cliche scheming that often makes up such character work. This creates a nice, friendly mood that complements the male protagonist's helpful nature, although it probably also shortened the time this manga could keep going due to resolving the conflicts that might have been milked (for good or ill) to extend it. It probably could have benefited from one or two more volumes to let the relationship arcs breathe, but the final chapter ended on a heartfelt note concluding Rei's story that kicked off the very first scene.
The male lead is nothing new in concept, but in execution his kindness is well demonstrated as his key appeal and the relatively few misunderstandings in play preserve the audience's sympathy for him and the cast.
Most of the girls interested in the protagonist are entertaining and interesting in their own right, with the protagonist helping them along their own character arcs soon after their introductions. Many entries to the harem genre neglect the character work, getting the audience to invest in only one or two characters, and then spotlighting them one at a time which leaves the audience bored and frustrated most of the time while they wait for their favorite character to take the stage. By making the cast more broadly likeable and giving them cooperative group dynamics, this work holds the reader's attention and provides more entertainment in its five volumes than many harem manga do in dozens of them.
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