While Airu is often seen as a cold antagonist, later parts of the series reveal that his harshness stems from a desire to protect the family after their father's death. He eventually becomes a subtle source of encouragement for Romio to grow stronger.
The story of "Romio and Airu" (often referred to as episode 10 of the anime) follows Romio as he navigates a week of intense pressure: 10 : Romio and Airu
Airu, the stern head of the Inuzuka household and a Black Doggy prefect, begins to suspect that Romio is secretly communicating with a "White Cat" girl—the enemy faction. While Airu is often seen as a cold
To "straighten him out," Airu puts Romio under strict 24/7 surveillance and tutoring for an entire week. To "straighten him out," Airu puts Romio under
During a search of Romio’s room, Airu finds incriminating items, including a rosary and a brassiere, which heighten his suspicions. He threatens Romio with expulsion and banishment from the family if he is indeed betraying their house.
