Anybody who reads these reviews regularly will know how I love detective stories, and also anything new and original. Put these together and you have this highly entertaining manga, which combines the puzzle solving of a mystery with a slightly SF twist. His elder brother hopelessly overshadows Ayumu despite his own impressive gifts, and thus this series will resonate for anybody who has been in this situation. Is it up to Ayumu to rescue his brother... or rescue other people from him... or rescue him from himself? This is one of the many mysteries that seem to get the characters deeper into the heart of the conundrum instead of solving it, hence the name spiral. Ayumu wrestles with some adult feelings, the two Blade Children make for interesting and bizarre villains and a sense of the plot thickening pervades the book. The protagonists in this book are all young, being just 10th graders, but that shouldn’t put anybody off what is a teasing, highly complex and very enjoyable story.