Fate/Grand Order: Fujimaru Ritsuka wa Wakaranai Season 4

Even with humanity's fate resting on Chaldea, Ritsuka Fujimaru still finds time to be baffled by the most ordinary questions. A battle report can become an impossible writing assignment, a tomato sandwich can demand tactical planning, and asking the wrong Servant for advice can create a problem much larger than the one Ritsuka started with.

Surrounded by Heroic Spirits whose personalities are every bit as formidable as their powers, Ritsuka stumbles through another collection of everyday mysteries. Saving history may be complicated, but understanding the people helping to save it can be even harder.