This ability is the upgraded version of the weapon ability "Nanomist". It enables the user to create a shield that can protect more than one people. However, if the user uses it to protect more people than one, it may fail after a time. The time limit depends on the users' ES class and abilities.
This ability can also be achieved by using the ability "Power". In Kiddy Grade Episode 23, Éclair used the exact same ability to protect herself. However, it seems that this shield can't be applied to anyone else, but only to the user.
A similar ability, but less effective is used by Guarding Robots in order to be able to protect their team. However, as the shield is applied to a larger crew, the shield itself is weaker.