Matagu Shidou is a supporting character in the anime Please Twins!, having previously appeared in its predecessor Please Teacher!. He is a high school student known for his serious demeanor and deep interest in astronomy. His personality is marked by extreme shyness and a lack of self-confidence, which makes him the most hopeless member of the male cast when it comes to romantic relationships. He is less confident and self-assured than his friends Hyosuke Magumo and Kei Kusanagi, and his crippling shyness prevents him from ever forming a romantic connection by the end of the series.

His most notable motivation is his fondest dream: to meet an alien creature from outer space. Unbeknownst to him, his teacher Mizuho Kazami is an alien, and he has conversed with her in normal settings without realizing it. He once considered confessing his love to her, but his shyness stopped him from acting on that impulse. In Please Twins!, his role remains that of a supporting character, interacting with the main cast within the school setting. While the character is described as being somewhat different in Please Twins! compared to Please Teacher!, specific details of that change are not elaborated. By the end of Please Twins!, Matagu is shown in a hospital with no visitors, underscoring his lonely and isolated situation. His notable ability lies in his knowledge of astronomy, which he pursues as a hobby.