Blackstar.

Blackstar. is a short story that is part of an anthology of short stories based on the Thus Spoke Kishibe Rohan series. It was written by Ryo Yoshigami (吉上 亮) and published by Shueisha. Blackstar. was included with the August 2017 issue of Ultra Jump to coincide with the eighth episode release of the Thus Spoke Kishibe Rohan series. It was then compiled in a collection with four other stories, which released for sale on June 19, 2018.

Summary
Rohan Kishibe is sitting at a café, drawing meaningless lines in his sketchbook on his day off. He has a visitor at his table, who stares at the lines that Rohan is drawing. The man has white skin, blue eyes, wears a suit, and has a muscular appearance reminiscent of an player. The lines that originally seemed meaningless now formed the face of a person as if it were a portrait. Rohan didn't intend to draw a human face, as he actually only drew lines and dots. In, this phenomenon is referred to as the Law of Prägnanz, in which humans have a psychological tendency to find something meaningful in an irregular pattern of dots and lines. Humans perceive the invisible as visible, and this law is said to explain most photos of "ghosts". Whenever Rohan draws manga, he always questions if his lines have any meaning. Manga artists must not draw meaningless things, because things without meaning have no reality. The man acknowledges Rohan's claim but rebuts that this rule doesn't apply in all cases, and sometimes people see things that they shouldn't. Rohan is shocked and asks whether the man is an editor of an occult magazine. However, the man states that he's an agent like he told Rohan earlier, and gives him a business card. Rohan learns that his name is Agent Gabriel (エージェント・ガブリエル).