Hotaru (Firefly) is a unique Sensory Perception granted to Ayabe by a combination of the denkouken and a piece of metal drilled into his Ajna chakra point. Also referred to as his Third Eye.
By opening his Ajna chakra point and unsealing Hotaru Ayabe is able able to sense electric, magnetic, and electromagnetic phenomena. This allows him to sense all forms of metal in the area including buried pieces of metal or weapons. Further training in this ability has enabled him to follow the electric and magnetic field lines using his eyes, which he takes a step further by analyzing the reflections of the electromagnetic waves he generates, allowing him to see the image of a room three-dimensionally without the use of his sight giving him no blind spots.