Mari Amachi leads a double life as an ordinary student and the superheroine Gootaman, defending PR Academy from the Black Buddha gang. Her civilian existence grows complicated when she develops romantic feelings for Tobishima, unaware he secretly leads the enemy group she fights. This creates profound internal conflict as her personal emotions war with her duty.

Adding another layer of tension, Mari's roommate Saori harbors unrequited romantic feelings for her, creating unresolved interpersonal complexity.

As Gootaman, Mari employs unconventional combat tactics, primarily using her buttocks as a weapon. Her superhero role requires a revealing costume consisting essentially of a thong. These actions occur within a context of slapstick humor and parody, framed as justice delivery, though this installment features increased nudity and sexual humor.

Her battles pit her against bizarre and exaggerated antagonists, including tentacle-based creatures and scenarios parodying broader pop culture, like a Terminator-esque confrontation, all executed with comedic intent.

Mari's core conflict revolves around the unresolvable tension between her love for Tobishima and his obligation to eliminate Gootaman. This opposition drives the narrative toward its conclusion, injecting tragedy as personal affection directly clashes with adversarial roles. The story ends without resolving this central romantic conflict or the love triangle with Saori, leaving Mari's personal future uncertain.