Memory Fiber

An SFD secret technology used to memorize astral abilities. Here are its following usages:

Heavy spoilers below: The memory fiber was used in copying Satoru's astral ability to lower the astral links of people that went into the berserk state, specifically Kotori. End of heavy spoilers here.
 * SFD Suit's invisibility/optical camouflage - the memory fiber is infused in the suit to allow usability of the invisibility
 * Copying Mayu's astral ability - this was used by Satoru and Nanami to bypass the authentication needed to go enter Mayu's laboratory