As Kaname grows older, he becomes an exceptionally powerful individual, capable of performing incredible feats, such as lifting massive weights and effortlessly defeating skilled opponents. Despite his small stature, Kaname's abilities quickly surpass those of professional athletes and even skilled martial artists.
The story centers around Aoi Hinozuka, a typical high school student who lives with his little sister, Mio. Mio is a sixth-grader who has an unusual aura surrounding her. Despite her age, Mio possesses exceptional looks, charm, and an array of talents, making her extremely popular among those who meet her. Aoi often finds himself struggling to cope with the attention Mio receives, as well as the teasing and confessions he receives from girls who are smitten with Mio. uchi no otouto maji de dekainn