The narrative begins with Gargantua's birth and childhood. He impresses his father Grandgousier with his intelligence, and is entrusted to a tutor. This education renders him a great fool, and he is later sent to Paris with a new tutor.
After Gargantua's reeducation, the narrator turns to some bakers from a neighboring land who are transporting some fouaces. Some shepherds politely ask these bakers to sell them some of the said fouaces, which request escalates into war.
Gargantua is summoned, while Grandgousier seeks peace. The enemy king Picrochole is not interested in peace, so Grandgousier reluctantly prepares for violence. Gargantua leads a well-orchestrated assault, and defeats the enemy.
Gargantua means a person of great size, such as a giant.
Five Gargantuas appear as optional bosses. They are artificial demons made by Dr. Thrill in his lab, which is located in the Sewer dungeons. After defeating one, a Dolly Kadmon appears from its body. All Gargantuas are Dark-Neutral aligned.
Devil Summoner: Soul Hackers[]
Gargantua Zero (ガルガンゼロ, garuganzero) has frozen the harbor warehouse where Dr. Thrill's lab has been relocated to, having been ordered by her master to guard the place, and must be fought to unfreeze it and gain access to Thrill's lab.