Nectar Arc

The  Nectar Arc (神の飲み物 (ネクター)  編) is the second and last story arc of Toaru Kagaku no Accelerator. It involves Accelerator and Last Order encountering and getting involved in the circumstances surrounding Himegi Matsuri, a princess-like girl with a mechanical heart, who is connected to a case involving one of the Board Directors and pursued by the dark side group Full Course,   as well as twin sisters Tobio Yumi and Mami.