When I picked this up I was expecting a very different story to the one I got.

The premise is that there's a little girl who is prepared to pay to rent an older brother.
I had an image in my head of the rental older brother being absolutely perfect with her during the rental period, and as soon as the time is up he becomes cold and only interested in the money. My thought was that this would be the start, and that gradually he would come to care for the lonely little girl.
This is the story I wanted to read.

Unfortunately, my idea of what the story would be, based on the blurb and the sample pictures on the back of the volume, was very different to the actual content. *possible spoilers ahead*

Basically, the little girl has an older brother who used to be sweet to her but, following the death of their parents, ignores her. She misses this so when the male lead sees her looking sad in the park one day, and offers to be a substitute, she decides she will pay for his time so it's less of a betrayal of her real brother.
I didn't get the male lead at all. I didn't get his niceness, and found his character quite boring.

There are some dark themes. The real older brother has become occasionally violent. I didn't get this either.

I wasn't gripped enough by what I read to want to buy the next volume. But I think this story has the potential to become more interesting. What needs improving is the male lead. I didn't learn enough about him in this volume to understand him or care for him.
The little girl's attachment to her brother despite his violence baffled me, too.