A drop of sweat bigger than the character's head. Blood shooting out of a nose. Blue vertical lines running down a face.
Watch enough Japanese anime and you'll see bodies doing things no real human body does.
Here's the short answer: these aren't physical reactions at all. They're symbols that tell you how a character feels, without a single line of dialogue.
In Japanese, these manga-style symbols have a name: manpu. Anime inherited them from manga.
Let's look at three of the most common ones, through actual anime scenes.
Manpu: feelings, explained in pictures
A manga panel only has so much room for speech bubbles. So manga developed symbols that let readers grasp a feeling instantly.
A light bulb over the head when someone gets an idea. A throbbing vein mark on the forehead when they're angry. Vertical lines down the face when they're in shock.
Japanese readers understand all of these in a split second, with no explanation needed. They're a kind of shared language, written in pictures.
The giant sweat drop: not hot, just in trouble
Heat sweat vs. manpu sweat
When anime shows sweat from heat, it comes with the context: a blazing summer sun, a hard workout.
The manpu sweat drop appears even in a cool room, even when someone has only been spoken to. And it's drawn at a size no real drop of sweat could ever be.
That size is the signal: this isn't about body temperature, it's about feelings. Japanese has a word for this: hiya-ase, literally "cold sweat", the sweat that comes from nerves or panic rather than heat. Think of the manpu sweat drop as cold sweat, wildly exaggerated.
And the meaning changes depending on whether it's one drop or a flood.
SPY×FAMILY: Loid's single drop
In SPY×FAMILY, Loid is an elite spy who handles every mission with cool precision.
Yet now and then, a single large drop of sweat appears at his temple. The cause is usually his daughter Anya doing something he never saw coming.
That one drop means exasperation or bewilderment: Well, this is awkward. How am I supposed to respond to that? It isn't panic. It's the face of someone taking half a step back and trying to process the situation.
A flawless spy who can only be made to sweat by a six-year-old. That gap is one of the show's running jokes.
Bocchi the Rock!: Bocchi's endless sweat
At the other extreme, one drop is never enough for Hitori Gotō, better known as "Bocchi", in Bocchi the Rock!
Bocchi is painfully shy. When someone talks to her, or when she has to stand in front of people, sweat pours from her whole face.
None of that sweat has anything to do with heat. Her nerves, and her complete lack of an idea what to do, show up as the amount of sweat.
If Loid's single drop means exasperation, Bocchi's flood means panic. Look at how much a character is sweating, and you can tell how cornered they feel.
Blue face and vertical lines: the blood drains away
A Japanese expression, turned into a picture
In Japanese, when someone gets a terrible shock, you say chi no ke ga hiku, "the blood drains away", or kao ga aoku naru, "their face turns blue".
The manpu of a pale blue face with vertical lines coming down from the forehead is that expression, drawn literally. The lines are like a dark shadow falling over the face. They show a mood dropping all at once.
Chibi Maruko-chan: Maruko's "gān"
The classic example is Maruko in Chibi Maruko-chan.
A bad test score, a plan she was looking forward to falling through, the certainty that she's about to be scolded. At moments like these, vertical lines appear on Maruko's face, and she freezes to the sound of "gān", the Japanese sound effect for a shock.
This face is so much a part of Maruko that her official figure even comes with a "shocked face with vertical lines".
Maruko's shocks are usually caused by small, very ten-year-old problems. But her face looks like the end of the world. The gap between how small the event is and how big the shock is is where the laugh comes from.
The nosebleed: a sign of too much excitement
What it means
In anime, a nosebleed usually means a character saw something too stimulating and got overexcited. It's especially common when they catch sight of someone they find very attractive.
Do people really get nosebleeds from excitement?
According to an ear, nose and throat doctor, excitement almost never causes a nosebleed.
So how did this become such a common image?
According to a professor of manga studies at a Japanese university, the origin is credited to gag manga artist Yasuji Tanioka in the 1970s. At first, though, his characters got nosebleeds whenever any strong emotion, like anger, boiled over, not just romantic ones.
Through the romantic comedy manga boom of the 1980s, it settled into its current meaning: the nosebleed of someone flustered by an attractive person. In other words, the anime nosebleed is a convention raised by manga, not by medicine.
One Piece: a symbolic nosebleed that needs a blood transfusion
The character who pushed this convention as far as it can go is Sanji in One Piece.
Sanji is the kind of character whose eyes turn into hearts and whose nose starts bleeding the moment he sees a beautiful woman. And in episode 529, during the Fish-Man Island arc, he gets so excited at meeting the mermaids he's long dreamed of that he loses enough blood to need a transfusion.
Normally, a manpu nosebleed is only a symbol meaning he got flustered. Here the show deliberately treats it like a real, serious injury, and his crewmates rush off to find someone who can give him blood.
It's precisely because you know the convention that you can laugh at how far the joke goes.
Subtitles don't translate symbols
The giant sweat drop, the blue lines, the nosebleed: in none of these moments does the character say a word.
Subtitles only show you the dialogue. But on screen, the symbols are telling you all along: this is how this person feels right now.
One drop of sweat, or a flood? How many lines on the face? A trickle of blood, or a fountain?
Next time you watch an anime, look at the little symbols happening beside the dialogue. The feelings the characters never say out loud are drawn right there in the picture.
More on reading Japanese anime beyond the subtitles: tsukkomi, boke and why yelling is funny, why first names make characters blush, youth slang like maji and oshi.
Sources and notes
- One Piece episode 529 synopsis: official site
- Origin of the manga nosebleed, and a doctor's view: Tukigata, Yoga Journal Japan
- Chibi Maruko-chan figure with the "shocked face with vertical lines": Otajo
- Manpu: Wikipedia (Japanese)
Names are written given name first, as they usually appear in English releases.