Aoi Housen

Growing up alongside Kouji, this devoted companion shares a deep-rooted history with the Aiba brothers that predates almost everyone else. She serves as a vital pillar of support for the duo, seamlessly transitioning between the protective role of an older sister and the nurturing essence of a mother figure. Driven by genuine care, she frequently dedicates her time to checking on their well-being and ensuring they are never truly alone.