Gekkoujuu

After the main character returned from school he was taking a nap at the bed in the room. At that time he dreamed that
he was chasing someone familiar in a dark place. It was 8 o'clock in the evening when he woke up. The light of the pale moon was coming from the window. The hero rushed to city under the full moon.
What fate awaits him?

[From vndbreview]