Ritsuka has saved humanity through sheer accident and persistent confusion. Season 4 keeps the formula that works: one guy asking "but why though" while Gilgamesh has an existential crisis. If you've made it this far, you know the show doesn't need plot, just Ritsuka's blank stare and whatever servant gets caught in his gravitational field of misunderstanding.

Ritsuka Fujimaru, humanity's last Master, is back for a fourth season of this Fate/Grand Order comedy ONA. Earlier seasons showed a Master who restored humanity yet stays honest to a fault and lost on nearly everything, from how full the Spirit Origin Storage is to when an important-looking item should be used. His naive questions keep unsettling the Heroic Spirits around him, and that slapstick setup carries on here.