A dad moves into a new house with his son and girlfriend. When he's out of town working, the son makes a new "friend" next doors.。《太阳》以近未来的日本为舞台，描写了只能在夜晚生活的新人类与在太阳下生活的旧人类之间的对立和融合，是一部追寻生存意义的人情派作品。。
