四コマ · Yonkoma
the medium at large · format
Four panels, read top to bottom, structured setup–development–turn–conclusion — a numbered set that is a page format rather than a cast.
Filed by its count, not its title
Its count and its English name happen to reduce alike, so both routes reach 4 · The Structure. The count is still what files it — the agreement is a coincidence, not the reason.
A comic strip of exactly four panels of equal width, read vertically. It is one of the oldest continuously published manga formats and still fills newspaper and magazine corners today.
The four panels map onto kishōtenketsu (起承転結), the four-act structure inherited from Chinese poetry: introduction, development, turn, conclusion. The third beat is the load-bearing one — a turn rather than a conflict — which is why yonkoma humour so often works by swerving instead of by escalating, and why translated four-panel strips can read as though the punchline is missing.
The constraint is total. Four panels cannot be borrowed against; a joke either lands in the fourth or it does not exist. That makes it the most rigorous training format in the medium, and a great many long-form artists began here.
Because it is the one numbered set in manga that constrains the author rather than the cast. Every other entry here is a count of people. This is a count of space, and it decides the shape of everything printed inside it — which is a more thorough kind of numerology than anything a villain roster can manage.