Ani ga Kareshi de, Gomen.

Synopsis

When his father remarried, Kazuichi was a timid boy who was easily bullied by his younger stepsister Yami. Through hard work, Kazuichi has become a handsome young man who's the president of the Archery Club and admired by everyone. All in an effort to impress Yami as a reliable older brother, or as something more? (Source: Shueisha, translated)