Yuichi, who lives in a company housing unit, has a daily routine of peeking into the life of the people living opposite through the window of his room. This is because the curtains are fully open, giving a full view of his boss's wife Yuria's defenseless loungewear and her voluptuous body. Yuichi has been Kokoro to Yuria ever since they were introduced to each other when he went to his house to look after his drunk boss. However, since she is his boss's wife, Yuichi tells himself to give up on the relationship as it is only something he can peek at through the window, but then an incident happens and the two suddenly become close...