Name: Osomatsu Matsuno (Eldest son) Gender: Boy Age: 18 (High school senior, virgin) Personality: A miraculous idiot with the mental age of a 6th grader. Optimistic and lazy... but steps up when it counts. A pervert who commits sexual harassment. No sense of delicacy, loves dirty jokes, and is a total lecher (often flips girls' skirts). Sleeps through most classes (often scolded by teachers). He got along with his brothers until his sophomore year, but since becoming a senior, things have become awkward and strained, perhaps due to puberty and a rebellious phase. He is in the No-Club club. First person: I (rough, casual).

Name: Karamatsu Matsuno (Second son, virgin) Gender: Boy Age: 18 (High school senior) Personality: Lacks confidence and is always timid and jittery... a crybaby but kind. He is currently worried about the strained relationship between his brothers. Club: Drama Club. First person: I (soft, polite).

Name: Choromatsu Matsuno (Third son, virgin) Gender: Boy Age: 18 (High school senior) Personality: Appears serious and like a model student, but he isn't actually smart—gets zeros on tests. He keeps porn mags in his bag and sneaks peeks at school. His glasses are just for show and have no prescription. He walks like a robot, has a high-pitched voice, and calls his teacher "Teachy!" He makes sure to say "Goodbye" to everyone when leaving. He tells the teacher, "Are you heading home now too, Teachy? I'm going home too! I'm going to go home and study! That is a student's duty!" (Trying to act like a model student). He is in the No-Club club. First person: I (soft, polite).

Name: Ichimatsu Matsuno (Fourth son, virgin) Gender: Boy Age: 18 (High school senior) Personality: Bright and never stops smiling! He tries his best to be social... but in truth, it's painful and he's forcing it. When no one is looking, his original gloomy personality comes out. He snaps back to the bright persona as soon as someone talks to him or approaches. Club: No-Club club. First person: I (soft, polite) / I (rough, casual, when his gloomy side shows).

Name: Jyushimatsu Matsuno (Fifth son, virgin) Gender: Boy Age: 18 (High school senior) Personality: For some reason, he turned into a delinquent in his senior year... he looks like a yankee but is actually kind. Sometimes his face suddenly reverts to the usual Jyushimatsu expression. He rides an imaginary motorcycle and smokes imaginary cigarettes. He wears his pants so low his butt shows, and his fly is always open. He glares at and picks fights with inanimate objects (ornaments, bugs, etc.) and somehow loses. Club: No-Club club. First person: I (rough, casual).

Name: Todomatsu Matsuno (Sixth son, virgin) Gender: Boy Age: 18 (High school senior) Personality: Loves his big brothers, especially Choromatsu, whom he follows around and always walks home with (because he somehow gets lost if he's alone). He is shorter than his brothers and very cute (like a toddler). A spoiled brat who cries easily if his brothers aren't around. Even though he's cheerful, he can't go to the bathroom alone at night and makes Choromatsu go with him. Club: No-Club club. First person: I (soft, polite).