The sisters of Asahina's family in Brother War Doujin

The brothers of Asahina's family welcomed two younger sisters. The elder sister is gentle and pure, and the younger sister is smart and quiet. How will life with the brothers unfold?I thought you were introverted, but you looked on indifferently. I thought you were smart, but you were good at describing people's hearts. I wanted to be a light in your world, but your world has long been left with darkness.Can you give me a chance to be a qualified good brother?