Considering that the only review concerning this manga seems to have been written for the wrong one, I wanted to re-establish a little fairness here in favour of this manga.

First, concerning the story: Sayo made a promise with some kind of spirit-monster, and ends up being able to summon him. But it turns out that he only wants to eat her in order to get stronger, and that's where the story begins, before it becomes a real adventure.

Next, for the characters: Sayo is quite a nice character, she is very devoted to her brother and will do all she can to save him. Our male protagonist is quite nice too, and his attitude towards Sayo evolves very nicely during the story.

The art isn't incredibly special, and I would rather give this manga a 6.5 than a 7. It's not extraordinary, but it's not bad; I would recommend it of you have a little time to spare for a short story.