Saburo Kazeta (風田 三郎 Kazeta Saburō?) is a psychic young man who is the leader of the Monster League and can become an armored larva-like mutant known as Sanagiman (サナギマン Sanagiman?) and also a more powerful blue moth-like mutant known as Inazuman (イナズマン Inazuman?) Saburo is supported by a mysterious figure known as Kageto Banba who gives him a device called the Zeber (ゼーバー Zēbā?), which enhances psychic powers.