Kono Onee-san wa Fiction Desu!?

Kono Onee-san wa Fiction Desu!? is a manga series created by the artist Mutsuki Tsutomu, first serialized in the late 2000s within the pages of Kadokawa Shoten's Comp Ace magazine. The series emerged during a period of significant growth for the 'moe' subgenre, focusing on the comedic and often surreal interactions between an ordinary high school student and an older, enigmatic woman who appears in his life. It reflects the era's fascination with metafictional tropes, playing with the boundary between reality and the artificial nature of character archetypes.

Mutsuki Tsutomu designed the work to lean into character-driven humor, utilizing a clean, expressive art style typical of seinen and shonen magazine offerings of that decade. The series explores themes of escapism and the influence of fantasy media on daily life. While it remains a niche title in the broader manga landscape, it is recognized by collectors as a distinct example of the domestic comedy style that defined much of the mid-2000s manga editorial output.