Souta Matsuda is in his mid-30s, obsessed with proving that Kaiju exist. Everyone around him sees them as cartoons, movies, or urban legend-level nonsense, but he thinks they're real.

He has zero official credentials, no funding, and no proof that he's a specialist in that category (which he jokingly laments he doesn't have), and he currently owes his landlord rent money worth six months.

He tries small, pathetic, or laughably bureaucratic ways to gather evidence, but that led him to finding himself in Ai Fujimoto's room, who also happened to be on the same subject.