Ameno Aoki

is a supporting character of the series. Izumi's mischievous younger brother, Aoki is carefree and very teasing towards his older sister, often making fun of her cold personality or calling Seika Izumi's girlfriend due to the two girls always hanging out with each other. As a result of his and Izumi's conflicting personalities, the two siblings often get into arguments which Minami often has to break up their fights by threatening them with no dinner.

Personality
Izumi's mischievous younger brother, Aoki is carefree and very teasing towards his older sister, often making fun of her cold personality or calling Seika Izumi's girlfriend due to the two girls always hanging out with each other. As a result of his and Izumi's conflicting personalities, the two siblings often get into arguments which Minami often has to break up their fights by threatening them with no dinner.

Trivia

 * He ships his sister and Seika greatly, often teasing the two about "Seizumi" - his shipping name for the two.
 * He shares his voice actress with Kaiba Mokuba from YuGiOh.