One day, a hole appears in the thin wall separating Hideki's room from the next door room due to a fight between the married couple Hikari and Yusuke who live next door. There is no way the hole can be fixed right away, so Hideki and Hikari gradually start to communicate through the hole in the wall. Hideki cannot leave Hikari alone, who is sad because her husband treats her carelessly, and he gradually becomes attracted to her...