Okujou Fuukei

Okujou Fuukei summary:

Though he was never aware of it himself, Minaguchi was always watching Andou. After being separated into different classes, Minaguchi found that the lack of Andou's presence actually developed into a sense of empty loneliness. But by coincidence, Minaguchi discovers that Andou always goes up to the rooftop on Tuesdays...