The manga follows the daily lives of two siblings: Akiharu, a younger brother with an intimidating and suspicious appearance, and his doting older sister, Yukina. The central premise revolves around the humorous contrast between how others perceive Akiharu and his true personality. Despite his scary exterior, Akiharu is genuinely harmless and shares a deeply affectionate bond with his sister, which the narrative treats as a source of comedy and endearing shenanigans.

The primary characters are Akiharu, whose looks often lead to misunderstandings, and Yukina, who is protective and caring toward her younger brother. Their relationship forms the heart of the story. The setting is a slice-of-life depiction of contemporary Japan, focusing on everyday situations where Akiharu's appearance causes trouble or comedy, only for his sweet nature to become apparent.

A notable narrative arc includes the progression and eventual conclusion of these comedic slice-of-life scenarios, as the manga runs for a total of 40 chapters collected across two volumes. The story begins with establishing the brother's deceptive look and the sister's unwavering affection, then builds through various comedic episodes that explore their unique dynamic before reaching its finale. The manga is a short, self-contained comedy about the gap between appearance and reality within a close-knit family.