By 2021, had evolved into what netizens call a bunka (culture). The phrase no longer required a photo. It was a genre unto itself.

Because it is a verbal meme, you will hear/see variants:

"Why is this hashtag #OtoutoMajiDeDekain so popular? Is it about tall brothers?"

: The manga explores the shifting power dynamic between siblings. The older sister, who used to look after her "little" brother, now finds herself physically overwhelmed by him, leading to a mix of protective instincts and flustered reactions.

:

Slice of Life / Romantic Comedy / High School Drama Logline: A popular high school girl’s life turns upside down when her timid, "average" younger brother hits a massive growth spurt over the summer, transforming into a towering "ikemen" (hottie) who now attracts more attention than she does.

The stranger looks up with puppy-dog eyes and says, "Nee-chan? What’s wrong?"