Spiral是什么意思

《推理の绊》
SPIRAL本意为螺旋，代表人物命运交叠错综。
漫画涉及克隆，SPIRAL亦代表DNA双螺旋结构，象征克隆人的命运纠结。
——推理的旋律,必定会演奏出真相！
简介：（E文版）
★Spiral: Suiri no Kizuna (Bonds of Reasoning) is the story of this mystery, into which Narumi Ayumu is drawn after an apparently attempted suicide at his school. The girl involved was a member of this mysterious group, a group that Ayumu's older brother, Kiyotaka, was investigating at the time of his disappearance two years earlier. So, against the wishes of Narumi Madoka (Kiyotaka's wife, and current detective), Ayumu begins his own investigation, assisted by the school's lone member of the newspaper club, Yuizaki Hiyono.
At first, Ayumu is simply challenged outright by the Blade Children, who claim to know something of the whereabouts of his older brother. Their "tests" are primarily tests of Ayumu's mental prowess and cunning, but occasionally test his luck as well (the Magic Squares/Bomb puzzle, for instance). As he