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The protagonist; a shy, diminutive younger brother whose physical endowment is the focus of the plot.
The setup is deceptively simple. The series follows a protagonist (usually the older sibling) who tries to show off their latest obsession—be it a cringey romance anime, a niche idol group, or a terrible attempt at cooking—to their younger brother. The title delivers exactly what it promises: the brother "seriously reacts." uchi otouto maji react to
At only two episodes, it is a very brief experience, serving more as a quick vignette than a long-form story. The protagonist; a shy, diminutive younger brother whose