Lightning background

In manga and anime, a lightning in the background of a panel or behind a character means they're shocked, as in, startled, dumbfounded, astonished.

In Japanese, this is called inazuma furasshu イナズマフラッシュ, "lightning flash," or kaminari furasshu カミナリフラッシュ, "thunder flash." The word "flash" refers to the sparks along the lightning, which are instances of Beta Flash.

Anime: Ore wo Suki nano wa Omae dake kayo 俺を好きなのはお前だけかよ (Episode 2)

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