Amentia

lee wee-jin normally endures each of his his high school days as a servant his perfect sister lee wi-na. however, he has a secret he can’t share with anyone—that he can materialize his delusions as he pleases. when he needs to relieve stress caused by his sister, he materializes a version of his own sister in order to punish her. but one day a black-haired transfer student says the following to wee-jin while wielding a knife against him: “you damn delusioner that materializes delusions, we wakers will get rid of all of you!“