I cannot give it less than 10/10 on everything. The story and the characters gripped me in the first two minutes, literally. And was hooked until the very last seconds. The twists and turns and somersaults the plot made are amazing. They could have easily decided to make it live action, but I'm glad the settled on animating the story. I only worry that no other anime will be able top this for me, the writing was a dream came true. They left a bit of a cliffhanger and I'm dying to know what will happen next. I hope they will make a second season.