CSS seems to be an electromagnetic field of some kind, which has the effect of blocking a communicator's abilities such as actualization.

Verification of CSS's existence in the manga is needed

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.