Kotomi arrives home only to find that her younger relative Ren has arrived for a week-long stay while his parents are away. She finds his overly familiar attitude bothersome, yet the lack of space leaves no choice but for him to sleep in her room. Following a frightening television program, Ren becomes too scared to sleep on his own, leading Kotomi to reluctantly permit him to join her. Their initial innocent attempt at comfort gradually shifts into something far more personal and sensual as the night progresses.