One day, a hole appears in the thin wall separating Hideki's room from the one next door due to a fight between the married couple Hikari and Yusuke who live next door. The hole cannot be repaired immediately, so Hideki and Hikari gradually start to communicate through the hole in the wall. Hideki cannot bear to leave Hikari alone, who is sad because her husband treats her so carelessly, and he gradually becomes attracted to her...