Namito Nagumo belongs to a trio of male troublemakers in his class, collectively known as the "mecha mecha mote te ru mondaiji sannin gumi" or MM3. He exhibits a somewhat perverted nature, often labeled as "ecchi," and demonstrates a particular fondness for sweets. Operating within MM3, he regularly participates in creating disruptions and posing challenges for the student council president, Mimi Kitagami, alongside his fellow group members.