I was just wondering where the trope of the protagonist tripping and accidentally groping someone first came from.
What's the origin of this trope?
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I will try to answer. I still don't know what is the pioneer of that fan service. But all I know that a shot like "Oops I grabbed your boobs accidentally" is very common in manga, especially shounen manga. Manga creator created this 'fan service' because shounen manga usually read by teenage young boy. Also, they believe, in teenage, young boy will love this kinda jokes because of for example they are going through puberty.
Here are my references
Book : "Understanding Manga and Anime" by Robin E. Brenner