Sasaki Shuumei is one of the two eponymous main characters of Sasaki and Miyano. While he has a reputation as a bad boy, he is very affectionate towards Miyano Yoshikazu and enjoys spending time with him.Initially, Sasaki is introduced as a bright and cheerful, if overly eager, upperclassman; however, this is not necessarily the whole picture. He can be rash and impulsive, acting or speaking without thinking of the consequences or the people around him. Though he does have some friends, Sasaki is something of a loner. In flashbacks, with his family, or when he is alone he is usually shown to be gloomy and quiet, often repeating the phrase "it's annoying." As such, his personality shifts quite dramatically depending on who he is with: with his friends and family he tends to be more blunt, while with Miyano he tries to be careful and softens his speech. He is tall and of average build, with lightly bleached hair that Sasaki rarely changes back to its natural shade. He has a snaggletooth in the left side of his mouth which shows when he smiles widely. He also has a number of piercings: three helix piercings and one lobe piercing in the left ear and two lobe piercings in the right ear. Appearance-wise, he gives off the impression of a bad boy to other students. Sasaki typically wears his uniform with a few of the buttons undone and a shirt inside. A cardigan or sweater is worn in the colder months.